Your son's son and your daughter's son are both nati (नाति) in Nepali — one word, either line. Hindi splits them: pota (पोता) through your son, nati (नाती) through your daughter. And that split lasts exactly one generation. Go one step further down and Hindi stops caring which line you came through, the same way Nepali never did.

The grandchildren

Relationship	English	Nepali	Hindi
Son's son	Grandson	नाति (nati)	पोता (pota)
Son's daughter	Granddaughter	नातिनी (natini)	पोती (poti)
Daughter's son	Grandson	नाति (nati)	नाती (nati)
Daughter's daughter	Granddaughter	नातिनी (natini)	नातिन (natin)

There's a trap in that table worth pointing out before you fall into it. Nepali nati and Hindi nati are not the same word. Nepali नाति is any grandson. Hindi नाती is specifically your daughter's son — call your son's son nati in Hindi and you've said something mildly wrong. They romanize identically, they sound nearly identical, and they mean different things. If your family speaks both, this is the one to watch.

Notice too that Hindi is doing here exactly what it does going up the tree — keeping the father's side and the mother's side in separate words, dada against nana. Nepali doesn't, in either direction.

Their husbands and wives

Each one takes their own term plus the ordinary word for a child-in-law: buhari / bahu for a wife, jwain / damad for a husband.

Relationship	English	Nepali	Hindi
Son's son's wife	Grandson's wife	नाति बुहारी (nati buhari)	पोत बहू (pot bahu)
Daughter's son's wife	Grandson's wife	नाति बुहारी (nati buhari)	नाती बहू (nati bahu)
Son's daughter's husband	Granddaughter's husband	नातिनी ज्वाइँ (natini jwain)	पोती दामाद (poti damad)
Daughter's daughter's husband	Granddaughter's husband	नातिनी ज्वाइँ (natini jwain)	नातिन दामाद (natin damad)

Hindi clips पोता to पोत before bahu — it's pot bahu, not pota bahu. The daughter's-line word doesn't clip: नाती stays whole in nati bahu. Small thing, but it's the kind of detail that marks the difference between someone who learned the word and someone who grew up with it.

One caveat on all of these: they're descriptive terms, not forms of address. Nobody walks up to their grandson's wife and calls her nati buhari. In person she's just buhari or bahu, usually with her name or an endearment attached — kanchhi buhari, the youngest daughter-in-law. The long form is what you use when you're explaining to someone else who she is, which is exactly what a family tree is for.

Below that, only depth and gender matter

Here's the part that surprises people. Past the grandchildren, both languages stop tracking which line a descendant came through. Jijunati means "three generations down, male" — whether the line ran son → son → son, or daughter → daughter → son, or any mix of the two. Hindi's parpota works the same way.

The son's-line / daughter's-line distinction Hindi insisted on one generation earlier simply evaporates.

Generations down	English	Nepali	Hindi
Three, male	Great-grandson	जिजुनाति (jijunati)	पड़पोता (parpota)
Three, female	Great-granddaughter	जिजुनातिनी (jijunatini)	पड़पोती (parpoti)
Four, male	2nd Great-grandson	पनाति (panati)	सरपोता (sarpota)
Four, female	2nd Great-granddaughter	पनातिनी (panatini)	सरपोती (sarpoti)
Five, male	3rd Great-grandson	खनाति (khanati)	छड़पोता (chharpota)
Five, female	3rd Great-granddaughter	खनातिनी (khanatini)	छड़पोती (chharpoti)
Six, male	4th Great-grandson	जनाति (janati)	लड़पोता (larpota)
Six, female	4th Great-granddaughter	जनातिनी (janatini)	लड़पोती (larpoti)

Counting from the grandchildren, each language climbs its own ladder. Nepali: nati, jijunati, panati, khanati, janati. Hindi: pota, parpota, sarpota, chharpota, larpota. Every rung is a distinct word, not a modifier stacked on the one above.

English gives up around the second rung. It spells out "great-great- grandson," then quietly abandons words for arithmetic — "3rd great-grandson," "4th great-grandson" — because stacking any more greats becomes unreadable. That's the English column in the table above: the relationship name spells the greats out, and the short label counts them instead.

Be honest about how far down these get used, though. The deeper rungs are traditional vocabulary, and most families never have occasion to say them — five generations of living descendants is rare. They exist and they're precise, which is more than English manages past its second great.

And their spouses, all the way down

Same construction as the grandchildren's: the descendant's own term, plus the ordinary child-in-law word.

Generations down	English	Nepali	Hindi
Three, his wife	Great-grandson's wife	जिजुनाति बुहारी (jijunati buhari)	पड़पोत बहू (parpot bahu)
Three, her husband	Great-granddaughter's husband	जिजुनातिनी ज्वाइँ (jijunatini jwain)	पड़पोती दामाद (parpoti damad)
Four, his wife	2nd Great-grandson's wife	पनाति बुहारी (panati buhari)	सरपोत बहू (sarpot bahu)
Four, her husband	2nd Great-granddaughter's husband	पनातिनी ज्वाइँ (panatini jwain)	सरपोती दामाद (sarpoti damad)
Five, his wife	3rd Great-grandson's wife	खनाति बुहारी (khanati buhari)	छड़पोत बहू (chharpot bahu)
Five, her husband	3rd Great-granddaughter's husband	खनातिनी ज्वाइँ (khanatini jwain)	छड़पोती दामाद (chharpoti damad)
Six, his wife	4th Great-grandson's wife	जनाति बुहारी (janati buhari)	लड़पोत बहू (larpot bahu)
Six, her husband	4th Great-granddaughter's husband	जनातिनी ज्वाइँ (janatini jwain)	लड़पोती दामाद (larpoti damad)

The same pota → pot shortening carries down the whole male ladder in Hindi: parpot bahu, sarpot bahu, chharpot bahu. The female line doesn't shorten — parpoti damad, not parpot damad.

A sibling's grandchildren borrow the same words

Your brother's or sister's grandchild is, linguistically, just a grandchild with a label in front saying whose line they came down.

Relationship	English	Nepali	Hindi
Brother's son's son	Grandnephew	भतिज नाति (bhatij nati)	भतीज पोता (bhatij pota)
Brother's son's daughter	Grandniece	भतिज नातिनी (bhatij natini)	भतीज पोती (bhatij poti)
Brother's daughter's son	Grandnephew	भाञ्जा नाति (bhanja nati)	भाँजा नाती (bhanja naati)
Sister's son's son	Grandnephew	भाञ्जा नाति (bhanja nati)	भाँजा पोता (bhanja pota)
Sister's daughter's daughter	Grandniece	भाञ्जा नातिनी (bhanja natini)	भाँजी नाती (bhanji naati)

Nepali marks the middle generation: bhatij only for a brother's son's line, bhanja for a sister's line or any daughter's line. Hindi marks it twice over — the same prefix, plus a head word saying whose child the grandchild is, pota through a son and nati through a daughter. And as with everything above, these are descriptions. Spoken to, they're just nati and natini, exactly like your own grandchildren.

Why this needs a tree, not a memory

Four terms for grandchildren, four more for their spouses, then a ladder of eight, then eight more spouses, then the same again for every sibling's line. Nobody holds that in their head, and nobody should have to — it's a lookup problem, and lookup is what software is for.

Naatri labels six generations down, automatically.

Add your family once and every descendant — and every descendant's husband or wife — is labelled with the exact English, Nepali, or Hindi term, from any person's point of view. It tracks relationships out to a 4th great-grandchild and their spouse; past that, even the vocabulary gives up and says "distant relative."

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