naches
A feeling of contentment at another person's successes.
uncountable
Fun of the nachas variety is most often attributed to the fun you get from your kids and grandkids, and sometimes even your spouse and parents and friends.
Where it comes from
From Yiddish נחת (nakhes), from Hebrew נַחַת (nákhat, “contentment”).
Adapted from the Wiktionary entry naches (CC BY-SA 4.0).