Needing advice

I often find myself getting so pissed off with family. I am a FTM to a 4mo baby. My husband travels a lot for work- he’s only home for 1-2 days a week. I’m the one who takes care of our son, take care of the house cooking and cleaning, all yard work, I am also going to school. The only relatives we have close by are my husbands parents, my in-laws, however they seem too busy ASKING to take care of my brother in laws 2 yr old baby boy. My in-laws watch their boy every weekend to give them a break/have a date night. I am not taking this lightly. I’m the one who could reallyyyyy use a break like that, especially since it’s always just me balancing everything. Why can’t they ever ask me to take the baby so I can have a night with my girlfriends or have a night with my husband when he’s home? I never get a text asking how I’m doing or anything. I’m starting to feel like they’re having favorites maybe? Idk. I told my husband how I felt- that I think it’s not fair that they get to go out every weekend and get breaks when I haven’t been asked once. My husband got pretty mad like I was talking shit about his family and said I just need to ask. I have trouble asking for help. Especially when they already have a baby every weekend. Why do I have to ask when his brother in law doesn’t ask, they reach out and offer. Any advice?