The Yiddish word for 'sister' is exactly the same
as in German: pronounced "SHVESS-tair".
You can say "Ikh lib mayn kleyne shvester" in Yiddish to express "I love my little sister."
In Yiddish, the word for cousin is "קוזין" (kozin).
"SHVES-tair" ... straight from German.
"Jewish" in Yiddish is "ייִדיש" (yidish), pronounced as "yiddish."
In Yiddish, you can say "kesheprsia" to mean my pleasure.
In Yiddish, you can say "eynzik" to mean okay.
In Yiddish, you would say "zay dankbar."
To say "nephew" in Yiddish, you would say "neve."
In Yiddish, husband is "man."
To say "Catholic nun" in Yiddish, you would say "katolisher nonne."
To say "Grandsons" in Yiddish, you would say "קיינעזעם" (keynezem).
In Yiddish, you can say "keyn problem."