Moving in..or not

Hey guys. Ill cut to the chase here. Throwaway. And on mobile.Been with my SO for 3 years. Their dad passed away over the summer and when the relationship has became sorta serious (6 months) I was asked to move in. I said no...here's some reasons.I have 2 kids from a previous marriage. Kids don't mind my SO at all but my SO dad only can handle so much. So it was best not to anyway because I wanted them full time anyway. Plus I have my cat hes maybe about 5/6years oldNow here's the thing. Ive been living alone for maybe 4 years now. By some time into the relationship bout 2 years things are going great and finding apartments together. He has standards. Before their dad died advice came in to buy a house. Im not against it but its a big thing since 1 we ain't engaged and 2 we haven't technically lived together.Fast forward to SOs dad passing and greiving. Moving in seemed like a good idea but it would me under SOs-moms roof.I've been living alone and independent for so long that I don't want to go backwards to go live underneath SO parents house. Financially it would be a good idea but...im getting second thoughts still because :parents houseShould this make us or break us? Should i make an Ultimatum?Ps. SO has more than well enough in his bank account to drop 2k for an apartment to start with and I always pay bills and know how to. Not like I wouldn't take care of SO anyway because (health issues). SO never lived alone anyway.TLDR: SO still lives underneath parents roof. Parent passed. Got asked to move in a while ago. Something that his parent wanted. Dont feel like moving because ive been independent for so long. Would like to get an apartment with SO. Doesnt want to until 2 years out (buy a house) my apartment is crappy (not to SO standards) via /r/relationship_advice https://ift.tt/37fUROx