Re: My daughter fancies her second cousin.
And how do you propose that should happen? By locking her in her room? Removing her access to the outside world?
To the OP: If cousin marriages are ok for you, at this stage in your life I mean if in the future you do see your kids marrying in the family, then you need to just have a talk with her, and say well you’re young at this point, crushes happen, but we shouldn’t remark about the crushes in the manner she has. It should remain crushes and when she talks to that boy she shouldn’t make anything too obvious. He is clearly waaay too old for her, and frankly, it’s a bit creepy :S That’s just my opinion. A 19 year old is at no point compatible with a 12 year old. Also, that she is too young to be dating or anything like that.
If you’re not ok with marrying into family, you need to let your daughter, and heck, all your kids, know that it’s not ok.