Same-gendered two-parent families - how do your kids address you?

This is NOT a question about the morality/ethics/suitability of gay or lesbian parents. Frankly, I don’t care what you think about them. :-)

My question is simply what do kids call their same-gendered parents? I mean, I assume that as babies are learning to talk, “Mommy and Mommy” would be confusing. So what do you use? Mommy 1 & Mommy 2? Daddy John & Daddy Henry? Just first names without any prefix? Mom & Mommy? Daddy & Father?

Thanks for your insights.