Babysitter - Now Hiring

I am posting this for my mom, I have 2 younger sisters 9 and 12 who can fend for themselves other than basic assistance with meals and help on/off the busses. The main concern is my brother 3 months old who has colic and will scream until purple despite all efforts, I do not have the mental health to take care of him, I've tried but I just can't. He has good days but there are a lot of bad ones, I'm unsure if this is a selfish posting but I just can't help the way my mom needs and she won't go to other sources for financial reasons. Even if it's just some days that would be amazing.