Abby and Jenna Bergman of Los Angeles have two mothers: Natalie and Kim Bergman. The lesbian couple was married in British Columbia in 2008 and has been legally recognized in California while Proposition 8 is being challenged.
"Love makes a family," said Abby, who is 13. "I always grew up this way. I never realized anyone was different."
Though Jenna, 10, thinks it might be "kind of cool" to know what it's like to have a dad, she has friends and even a teacher with "two mommies."
The girls have uncles and a grandfather who have been a male presence in their lives. They also like making two presents on Mother's Day -- "double the fun," said Abby.
For the most part, their lives are not unlike their schoolmates', though every once in awhile they encounter ignorance and homophobia.
"Once at camp I remember talking to a kid and becoming rather close, but when I told him I had two moms, he avoided me for the rest of the week," said Abby. "He was afraid because his parents had said something to him."
Jenna, too, said when she was younger some of her classmates thought her family was "weird and didn't understand it."
The girls have been told by their mothers, "you can marry anyone you want, regardless of gender."
For Julien Goutierre, who is heterosexual, growing up in a same-sex family has expanded his view of relationships.
The 33-year-old health care worker grew up in Paris with a gay mother who introduced her partner to her son when he was 13.
"I preferred it be a girl than a man," he told ABCNews.com. "A woman would be less dominant."
Claire Elkins, an American, and Barbara Goutierre, who is French, married in Vancouver in 2003, and their son said their relationship has shaped his own character.
"I am very tolerant about gay people, and with my girlfriend I shared the housework, cleaning and doing all the dishes," said Julien Gouttiere. "In France, that's something men just don't do."
Meanwhile, Elizabeth Wall, who is also straight, agrees that being the daughter of a gay couple has made her more tolerant of others, no matter what their racial or religious background.
"It's given me a lot more confidence in my family and makes me a stronger person," she said.
Houck became her second legal parent after the ACLU took on their case, the second in the state, to challenge the adoption laws in New Jersey.
"It opened the door to others," said David Wall. "I worried if something happened to me that my brother would get Elizabeth instead of Bob."
Though they had been legal domestic partners since the early 1990s, Wall and Houck exchanged vows in a civil union at their church in 2007, and their daughter took part in the ceremony.
Today, Elizabeth Wall said life with her two fathers is no different than having a mother around. "Both are very open and emotional," she said.
And like any set of parents, one is more permissive than the other.
"When I scream, 'Daddy,' they know which one I want by the tone of my voice," she said. "There's a Dad who says 'no' to everything and so I know which Dad to go to if I want something."