Q. I’m an ovel for my father, can I take my children (My wife is taking care of the small ones) to a Chanuka party where there will be games and activities for them?
Can I take them to a water park in Niagara during their Chanuka break?

A. Poskim (Maharam Mintz 86, Darkey Moishe, Shiurei Knesses Hagedola 371) permit a Rabbi to officiate in a wedding during avelus, as well as a music teacher to teach then (Mishmeres Sholom 20;19, Eishel Avrohom 551:10.) since they do not intent or partake in the joy.
Horav Shlomo Miller,s Shlit’a opinion is that if your purpose and intention is just to take care of the children and it is basically a task and a chore that you are performing for their benefit and enjoyment, it is permitted.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a