Some Indonesian relationship terms:

kakak older sibling
adik younger sibling
Even twins get divided into kakak and adik.

Saudara male relative in the same generation (includes brothers and male cousins)
Saudari female relative in the same generation (includes sisters and female cousins)
Also a term of address used to promote solidarity; not as common as adik and kakak for actual relatives.

bapak and ayah father. I think ayah implies a closer less formal relationship.
ibu mother
bapak and ibu are also used as terms of address, Mr. and Ms.; also seorang bapak a man seorang ibu a woman
orang tua parents (literally old people: in slang abbreviated to ortu)

kakek grandfather
nenek grandmother
also used to mean old man or old woman (also note: nenek moyang the ancestors)

anak child
putra son putri daughter (much less commonly used than anak)

ipar brother or sister in law
menantu son or daugher in law
mertua parent in law
besan son or daughter in law's parent

om or paman uncle (om is also used as a friendly term of address to a man of one's parents' generation)
tante or bibi (again tante is also used as friendly term of address to a woman of one's parents' generation)
keponakan nephew or niece (but unless you were being very precise you would probably call them anak)
sepupu cousin (again you would probably call them kakak or adik)



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