Am I the bad guy/woman?

So my mom wants to let this guy and his daughter stay with us "a few days". But I don't feel comfortable with him staying at our house and my siblings don't either. Nobody has an issue with his 4 year old staying over. The thing is his family lives in the apt upstairs and the brother in law doesn't want them staying at their house. But to me it didn't make sense that we should bring them in. They aren't our family and honestly I don't know him that well. So my mom and my brothers girlfriend were arguing with me saying that I was being judge mental and how I shouldn't be negative. Like I'm condemning him or something. But he's not family and we live in a tiny apartment. My mom has this thing where she likes to let people stay because "they have nowhere to go" and never asks me if I'm ok with it. I've once had my iPhone charger stolen and random people go into me and my sisters room. Is it wrong that I don't want to house random people even if my mom "knows" them?

You are being the smarter one. If this person stays more than a few days this becomes his residence and he will have to be evicted to get him out. Not a good move since it seems he has no where else to go so he may become permanent.

YOU ARE THE INTELLIGENT ONE!

Once it gets around that your mother is an easy touch for someone who has nowhere to go and no resources, she becomes a target and so do you! Why would you allow just anyone whom you don't know to come into your home and stay for an extended period of time?

Would you get into a car with just anyone who offered you a ride? Hell, no!
If you are a minor child, it is your mother's responsibility to protect you from harm and from thieves and strangers in your home… She could be reported for child endangerment.

I'm sorry, I wouldn't like it either. I can't imagine why your mother is doing that.

I don't think its wrong for you to feel that way but since its your mom's house you don't have much choice