should i move into a basement. looking for advice

[Sherwin Vargas]

Hey guys I am an amateur real estate investor. I currently own one property multifamily property and am looking for advice on an idea I have.

I have been living in Boston( 5 minute drive to my job) 3 yrs paying this crazy Boston rent (1200 a month for a 1 bedroom in the hood). My pregnant girlfriends family own a home about 35 minutes away. They would let me fix up the basement and build a little apartment but not charge me any rent since I am paying to fix their basement and we would help pay some bills. I'm figuring we would spend 4k on materials 0 on labor. Uncle who owns a construnction company will be building and I am handy also

I am wondering if this is a good idea