An Egyptian scribe believed that a man had several components, and that one of them was his name. Erase the name from the monuments and you did not merely insult him; you performed the second death, the one that finishes what the first began. Rome later took the same view from the other side and made a legal instrument of it, striking a disgraced man's name from the inscriptions so that the state could kill him twice.
Every culture built machinery for its dead, and the machinery is not folklore. It is infrastructure, and it sorts into a small number of operations that keep reappearing in places with no contact between them. Anyone working on their own line is running some of these already, usually without knowing which, and usually missing one.
Registration
Keeping the dead on the ledger, by name. Chinese lineages compiled zupu, genealogy books running dozens of generations, and set ancestral tablets on the household altar. Jewish practice marks the date of a death every year and reads the name aloud. The Egyptian doctrine above is the theory in its purest form: the name is a component of the person, so being forgotten is not sad, it is fatal.
The inverse proves the rule better than the practice does. Damnatio memoriae and pharaonic name-erasure are states weaponising exclusion, manufacturing an unregistered dead deliberately, which is only worth doing if registration does something. And the largest registration operation in human history is one that most researchers use without noticing its purpose: FamilySearch exists because Latter-day Saints need genealogical records in order to perform ordinances for the dead. Anyone tracing a colonial parish register is running on rails another tradition laid for its own ancestor doctrine.
Feeding
Scheduled transfer of something valuable to the dead. Vedic śrāddha offers rice balls by name to father, grandfather and great-grandfather, three named generations and no further. Chinese families burn spirit money, Mexican households build ofrendas, Catholics have masses said, and Jews give charity in a parent's name. The forms differ and the schedule does not: it happens on dates, and somebody has to do it.
What happens without it is described identically across traditions. The unfed dead turn into hungry ghosts, preta in the Buddhist vocabulary, and a hungry ghost is the excluded member of the family systems literature wearing older clothes. The Ghost Festival and Obon are annual re-inclusions of those forgotten dead, which is a maintenance cycle for the excluded, run on a calendar, by an entire civilisation.
A hungry ghost is the excluded member of the family systems literature, wearing older clothes.
Embodiment
Lending the dead a living body so that a transaction can complete. At an aristocratic Roman funeral the imagines, wax masks of the ancestors, were worn by actors who walked in the procession as those men, and Polybius describes the effect on the young watching. Yoruba egungun masquerade does it in cloth. Mediumship does it in trance, and Kardecist Brazil does it weekly.
The clinical version is more recent and less exotic than it looks. A representative standing in for a stranger's grandfather in a Heidelberg seminar room is doing what the mask did, and the lineage is direct: Hellinger spent sixteen years among the Zulu before he built the method. What every version has in common is that the living supply the body, which is also the honest reason the operation works. Something has to be present for a settlement to be made to, and the dead cannot attend.
Settlement
Converting an open liability into a closed entry. Buddhist merit transfer assigns the good of an act to someone else's account. Purgatory built an entire economy on the premise, and the Reformation was, in these terms, a war over who may operate the ancestral ledger. Mormon proxy baptism has the most elegant consent architecture of the lot, since the dead are held to be free to refuse what is offered.
The Jewish version is the masterpiece of the category. Sanhedrin 104a rules that a son confers merit on his father, which makes the child his parent's posthumous advocate, and turns a grief practice into a legal instrument. The West's founding drama runs the same operation at civic scale: the Oresteia takes a three-generation blood entanglement that no revenge could close, and closes it by inventing a court. The Furies are not defeated. They are given an office and a new name, and settlement by institutionalisation enters the record.
Release
The unbinding, and the operation most often left out. Śrāddha ends with sapindikarana, a rite that converts a wandering ghost into a seated ancestor, a status change performed once and not repeated. Obon closes with fires that send the visitors back. Jewish mourning is staged decompression, seven days then thirty then the year, and the mourner's Kaddish for a parent stops at eleven months rather than twelve, a deliberate short measure so that the practice cannot become residence.
Each of these is a deadline written into the rite by its designers. That is what makes them designs rather than customs.
Systems That Never Let Go
Which gives a diagnostic sharp enough to use on anything in this territory. A healthy ancestor system has all five operations and closes with the fifth. A pathological one has a rich registration, an expensive feeding, a vivid embodiment, an endless settlement, and no release at all.
Perpetual chantries, endowed so that masses would be said for a soul forever, are the pure case: a liability deliberately structured never to close. Séance dependence is the domestic version, where the bereaved keeps the appointment weekly for years. The commercial versions are recognisable by the same missing part, an unbounded settlement claim wrapped in a steep ladder of authority, and they are worth studying as exhibits in how a school drifts rather than as methods.
The test is blunt. Ask of any practice offered to you: what closes it, who declares it closed, and what does the practitioner do the day after. A system that cannot answer has removed the exit on purpose.
How Far Back to Clean
The Torah states the inheritance doctrine as a pair of opposed functions, and the asymmetry is the point. The iniquity of the fathers is visited to the third and fourth generation; covenant faithfulness runs to thousands. A designed decay function set against a designed amplification function, with the debt side capped and the credit side effectively unbounded.
The Gemara then supplies the operating condition. In Berakhot the visiting is held to apply only when the children hold their fathers' deeds in their hands, which makes inherited debt conditional on re-enactment: any generation that stops performing the pattern breaks the chain, whatever it inherited. And Makkot records the amendment, where Moses decreed generational visiting and Ezekiel annulled it, the soul that sins shall die. A tradition version-controlled its own inheritance doctrine in public and kept both readings in the canon.
Three or four generations is the horizon of live contact, the furthest ancestors whose nervous systems could write directly to yours through people you touched. It is also, without any contact between the traditions, as far as śrāddha feeds by name. So the answer to how far back a person must clean is a test rather than a count of generations: as far back as the pattern is still being enacted, which almost always sits inside the contact window. Past that horizon you are no longer paying debts. You are building the credit side, and the registry compounds.
Executorship
All of which suggests the frame to hold toward the dead, given no theory of where they are.
You are the current living operator of an account opened long before you. The ancestors are its verified deposits and its open liabilities. The job is executorship: settle what is still enacted, register what was earned, release what is finished, and hand the next operator a cleaner install than the one you received. That is a worldly description, it survives the loss of every metaphysical claim attached to it, and it happens to be what all five operations were built to do.