I'm sorry Bette. My boyfriend and I aren't engaged, but his mom is kinda posessive too. She bought the properly across the backyard lake from her and thought that she could build a house there and then we could live in the current house while she lived across the lake. She wanted to build a bridge across the lake too! I totally sympathize with you.
Don't get me wrong, she's actually really nice and I guess it was thoughtful of her to offer that, but it really creeps me out! Maybe I should tell her that she won't have any grandchildren if she just lives across from us.
