If they're young children, they wouldn't know any different, Kuja. That doesn't really respond to either question either...

1.) DFD has it right. It depends completely upon the people for parenting skills. As far as other children teasing them, I really would not like to be the child. Children are downright cruel.

2.) On the bright side, you know they didn't get married just because one of them got pregnant, so it'd have a higher chance of a loving parental unit. The child has less of a chance to grow up a homophobe.