Well that sounds like a hoot! My wife's side of the family is very similar, so playing games with them is...well, an experience xD. They too are not good losers nor are they very gracious winners all the time. I've always preferred single player/co-op with a friend or two, so I'm not very used to the ferocity of people who are super competitive. 

We'll be heading up there next week, so we'll see how that goes xD

And hey, speaking of games, feel free to add me as a friend on SWTOR. I know I've alluded to it before, but just realized it might be easier if you had my contact info. My character's name on SWTOR is, unsurprisingly, Yerbol xD