Question:

I want to get my father a birthday gift. He is in mourning but after shloshim. Can I still get him a gift?

Answer:

You are not supposed to give gifts to a mourner for the whole twelve months. This applies especially to a person who is in mourning for a parent where the period of mourning lasts a full year1)Shulchan Aruch Yoreh De’ah Siman 385:3 and the Rema’s comments there.

References   [ + ]

1. Shulchan Aruch Yoreh De’ah Siman 385:3 and the Rema’s comments there