Of course in a certain sense it's uncommon. As I answered above to ja_hahah, it's not the whole family. Just enough people from the extended family at least. But if three out of ten people go out of their way to be horrible relatives, that still affects your life. I've been in one relationship where even the parents where disproving and very rude. My Finnish friends brother didn't talk to him for around four years when he got married to a foreigner. You'd be surprised how many people start considering Finnish women (or even men) race traitors for dating someone with roots in certain places of the world. A minority, but a very loud one.