落叶归根

a falling leaf returns to the roots (idiom); everything has its ancestral home; In old age, an expatriate longs to return home.

fig. a tree may grow a thousand zhang high, but its leaves return to their roots (proverb); fig. everything has its ancestral home

to return home (after a lifetime's absence); to go back to one's roots

to go back to one's roots; to return to one's native place

the return of a prodigal son (idiom)

spilt water returns to the trough (idiom); fig. people remember where they belong