So far, All I really know, is that the Graham's (Or at least I am) tend to be in Ravenclaw. Feel free to correct me on that. Also, the family curse seems to be transfiguration. (It took me 30 tries to get the lapido spell to succeed)
It turns out that the Graham's are all over the place when it comes to house sorting. Except there are no Slytherin members (For now). However, we are all muggle-born (I don't know how 2 muggles gave birth to 15+ Witches/Wizards). I still don't know for sure what the family curse is, but I'm going to go with transfiguration.