I went with Danny. Cheating doesn't really exist in the FH home I don't think, lol. Since Pam had blonde hair I don't think it's really necessary that Danny does too. Even if both had darker hair, I'd still say they were the parents unless an episode told us otherwise. After all, if she had had black hair like Danny one could question then how Pam was related to her.
What do you think, TannerForever?