sound proofing?

so my grandpa has split a house into 3 badly i might add but there’s a vent that goes straight down and sound can travel between the 3 apartments/ house like crystal clear i have a baby and my neighbors are a guy who is lowkey losing his mind and a lady who has a lot of ppl in and out so a lot of conversations which WE HEAR really bad at night any ideas too help with sound proofing … im deadass abt too lose it from lack of sleep and i really just want too cry rn bc they won’t shut the fuck up and it’s 10 pm i put my baby down at 9 why the actual fuck is she awake