Re: marrying your cousin when your parents are first cousins..
but there is no guarantee that things will stay the same after marriage. i've seen many family problems, and before marriage things were hunky dory. so now there is an increased risk that the children will have genetic problems, those that have been hidden away will emerge now, and inter-familial problems.
There s never anything certain in life except death and taxes!
If you like him or you will start liking him in the near future you should consider it. But dont do anything because you feel sorry for them. Thats not a good reason to get married. I know I didnt help out at all :D but its a descision you will have to make for yourself eventually :)