In laws for Roommates

27 years old.

Working full time.

My sweetheart and I have been together for 8 years and just purchased a home last September. We wanted to start our life together.

Now he is wanting to move in his siblings into our home.

Back story. His mom had passed away and so his step dad is left with 3 teenagers. Well his step dad is already in a relationship with another woman and pretty much moved into his parent’s house and would leave his kids there. He is never home due to work and being with his new girlfriend. So my boyfriend feels like his younger siblings are better with us because they are miserable where they are.

Am I wrong to not want them to live in our home? It’s already enough having to learn how to live with my boyfriend and our new chapter. I’m not ready to parent these teenagers. I understand he wants to help his siblings, but I can’t seem to change my whole life and live with other people.

Anyone experienced this before?