Need Advice --kinda long.

Mercedez • Mommy to Leilani Ava Casnova born 4/4/15. 🎀💕 Pregnant w. My Boy—hoping for a healthy 9 months🤞
So I live in a 3 flat with my SO and 7 month old and the building next store has a couple with 3 kids--two kids around 4 and 5 a boy and girl, and the mother just recently had a baby 2 months ago. Well every night around 11:30 I hear the father yelling on the top of his lungs to SHUT UP! At the crying baby. I don't know what to do!!! I get so furious and the mother doesn't say one thing. One time I heard him say Shut the f*ck!! it's bad enough I have to hear him(the 2month old) cry. Should I mind my own business? I just feel like I should do something because the crying is none stop and I just feel like he should in no way talk to a young child like that. Help!!!