I bought this home 6 months ago, the home is 50+ years old. The addition on the back is 30 years old and within the last few months i have noticed a crack in the brick work outside and now i have a hump in my kitchen floor where the addition meets the older house. I don't know what to make of it, wouldn't the settling be done by now? I live in michigan and it is cold with a lot of snow, i worry that i might have a sink hole or something going on in my backyard. I don't know what to do, part of the addition is my daughters room. Anyone have any ideas?