<human>: My boyfriend's mom has moved across the country when he was 4 and left him and his sister with his dad. They stayed on good terms and she visited a few times over the course of 20 years. 

Fast forward to present day. She decided to up and move her and her husband(boyfriend's step dad) back here, because he 22 year old daughter got pregnant and had a baby and she wants to be close to her grandson because she wasn't there for her own kids. 

Well she moved down here and has been staying with my boyfriend for the past 5 months, it was supposed to be a short stay.... My boyfriend and I are coming up on our 1 year. 

I do not live with my boyfriend but spend the night 2-3 times a week. At first I was fine with the new situation but now I feel like they are wearing out their welcome. Her daughter has also temporarily lost custody of her son and his mom stepped in and took him so now the baby is living there as well. She has started to make comments about how I and her son need to have kids, and constantly tries to talk to us about our sex life(which is great, but has gone down a tad bit since they moved in and are always there).

How do I talk to my boyfriend about this without making him upset because he has no problem with the situation so far. I don't want to overstep any boundaries.

Can you summarize the given text in a few sentences?
<bot>: boyfriend's mom is butting in on his home life, our relationship, our sex life, and looks like she's not going anywhere soon.