Personally, I couldn't have borders in my house with if I had children, unless it was a close family member. There are a lot of things that could happen. Your daughters (teens) may feel like they have to play with and/or entertain the 3 year old or the 3 year old could get into their stuff. It could be stressful. Why does the grandma have custody? I know my aunt and uncle took in their nieces because of molestation happening to them living at home and then they went and molested one of their own kids. These girls were only 2 and 5 when they brought them in. They don't have to be teens to abuse. Don't want to scare you but it could happen. What about visitors? Can she have any? Too many "what ifs" IMO. Good luck in whatever decision you choose

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