Enkelkinder
The German word for grandchildren is Enkelkinder (or just Enkel)
The Maori word for grandchildren is mokopuna.
The Yiddish word for grandchildren is "קינדער" (kinders).
grandchildren = petits enfants
Yes, "grandchildren" is a compound word formed by combining "grand" and "children" to refer to the offspring of one's children.
The Welsh word for great grandchildren is "awyrennau mawr."
Yes, "great-grandchildren" is hyphenated correctly.
Grands
Chre is not a German word
Since "grandchildren" is already plural, the spelling would have to be the possessive form, which is grandchildren's (e.g. she saved all of her grandchildren's school photos).
The German word for "Who" is "Wer".
The German word for their is "Ihre."