三親六故

old friends and relatives

three / 3

parent / one's own (flesh and blood) / relative / related / marriage / bride / close / intimate / in person / first-hand / in favor of / pro- / to kiss / (Internet slang) dear

parents-in-law of one's offspring

six / 6

happening / instance / reason / cause / intentional / former / old / friend / therefore / hence / (of people) to die, dead