Am I wrong for feeling this way?

So I’m in my 3rd trimester of pregnancy. I have a 1 year old. I’m married but still live with my mother until my husband & I can afford our own home. Also we’re helping my mother out who is single. We live in an expensive state so its been hard. Every time we are close to making progress something happens & we’ve been set back. Anyways this pregnancy was unplanned. Otherwise I would’ve waited until we moved out already to extend our family but things happen. So about a month or 2 ago my husband gets continuous phone calls from his mom. She’s complaining about his little sister who is 14. She’s not going to school & is constantly arguing with her. His mom also has a 2 year old btw.

She ends up asking us if we can take her in. She said she can do provide for w.e her daughter needs. Mind you this is the 3rd child my family has taken in. Including my husband. He got kicked out at 16. He’s been with me since. Then she kicks out his younger brother at 16 & he stayed with us for a few months. Now she’s kicking out her 14 year old & is now with us. I’m conflicted because its his my husbands siblings but its getting tiring keep taking in her kids. The fact that she’s still having more kids is beyond me. I can judge because if you keep sending me your kids I have a say in you keep on producing more kids.

Anyways I had to become the guardian because my husband works. My mother & her have problems so theres nobody else that could ve her guardian but me. I am beyond stressed. My comfort was already limited because of staying with my mom & sister. Then to add another child & make them my responsibility is completely stressing me out. I’m due soon & I already have my own kids. Now I’m forced to be responsible for his sibling. I have no personal issues with his sister but at this part of my life is the wrong time to take her in. We’re drowning in bills. She says she’ll contribute $200 a month for her kid which is not a enough for a 14 year old especially girl. Besides already financially drowning. Her school is intervening with my appointments for my kids. She stays in the living room because we have 0 space for her. The living room is always a mess. Her mom won’t buy her a phone so its been me & my mother responsibility to wake her up for school. Mind you im pregnant & already uncomfortable. Its such an inconvenience to me. I don’t have it in me to take care of 2 kids under 2 & a teenager (thats not even my kid). I’m only 23 & its so unfair. We were about to start doing good before his mother & her drama. Am I wrong for being angry? Its getting so overwhelming. My husband doesn’t understand because he’s at work & I’m responsible for everything. Luckily my mom helps but still its his sister & his mothers daughter is not my moms responsibility. In fact she’s not anyone’s responsibility but her mothers. Its his sister but its messing with me mentally. Idk what to do. Idk how long she says staying but I honestly can’t deal with it.

I forgot to mention that her daughter doesn’t want to go home. She kicked her daughter out of her own room for her husbands brothers to live in & has had her daughter sleeping in the living room. Also not sure if I can call cps because her mom is not legal in the U.S so not sure if they would deport her or not. Wouldn’t want to take that chance for my husbands sake.