<human>: Can you condense the text into a few key points?

Hey Reddit,

Since September, my mom and dad have been stuck with letting my sister's boyfriend stay in our house. My sister brought him in without letting any of us know, as she wanted to get him clean (Heroin). My mom, dad and I were all fine with this, until I see the mental anguish it is leaving on my mother. 

 I ask why they do not say he has to leave, and they tell me they are scared of doing it as he has a drug problem . The thing with this, is that he has been in our view after we found out he did this in February (sis knew, and did not even tell us. we found out on our own). We have been checking his body, and he is coming clean every time. He has a car which is currently in the shop, but will be fixed by Friday.

I feel bad for the guy, too, but I feel worse for my mom. He asks for money and she has no guts to say no to him. He eats all our food, and always drives her car because his is broken.

I have severe social anxiety, and cannot get courage myself to kick him out. And since she is my ride to and from school, she spends all of the ride crying her eyes out because of her desire to kick him out, but her heart says not to. 

As for my dad, he is always angry when he gets home from work because of the situation. I don't know why he is afraid to kick him out, because he acts like he has the guts to. He keeps making goalposts and never acts up on them.

Please help me figure out how to help my mom, she is being taken advantage of..
<bot>: Sister snuck ex-druggie boyfriend into our home, mom and dad are too hesitant to kick him out.