So far there have been 9 children on my island and they are nearly ALL BOYS! Is there anything you can do about this?

Girl #1 and Boy #1 had 1 girl and 5 boys

Girl #1 and Boy #2 had 1 boy

Girl #2 and Boy #3 had 1 girl and 1 boy

My island started out with only 1 female, so you can see my problem? I now have 6 males to the ratio of 1 females w/my children and 5 males to 2 female ratio with my adults.

Now, I refuse to try and match up brothers/sisters and I'm assuming the game doesn't allow that? I don't want my little villagers hooking up with family members while I'm away.