At the start of the covid crisis, (in Australia) my daughter left home. She wanted to be with her boyfriend, and the lockdown  rules said that they couldn't see each other. She was gone for weeks; I was so sad. She brought me flowers a few times; it was sweet. I have OCD so when we had covid in Australia, I was kind of paranoid and didn't go outside much. 
Anyway her boyfriends mother decided to move out of the family home. Leaving both kids homeless. Both kids in their senior year. Don't ask- I don't understand it either.
They moved in here, and I'm loving it. They've been here for. almost a year and I love them both so much. I've taught her bf to drive and he goes for his driving test in a few weeks. I am really enjoying being present and helpful Recently, I attended their graduation dinner. My parents came.

His mother said "he eats a lot, wow it cost a lot to feed him"
My mother choked because I have been feeding him all year-she can't get over it. She's never offered to contribute to his food bill. He is, for all intents and purposes my responsibility. He is oblivious to this. He costs a LOT to feed.

I know my daughter loves and respects me. She can be a jerk at times but she knows when to say "Thank you mum"  and when I am angry, she makes me a coffee and starts joking with me. I think we have a good relationship. I don't understand Louis though. It seems like the nicer i am to him the ruder he is. I want to proide a stable home but it's hard when he has no respect for me. I dont want to throw him out in the street- he's a kid
What do people think?