No, Matthew, what is different is that there are two few testicles in the house.
That sentence is so far off the mark...
A) No, that fact is about the only thing that makes your family RESEMBLE other families. You don't have the corner on that market (kids out-of-wedlock, divorced/widowed parents who choose not to marry their new "friend", etc).
B) The thing that makes your family different from other families is that your Mom engages in an activity that makes marriage illegal. Like, if your Mom had instead chosen an already married man as her lover. Or a priest.
See, equal rights doesn't mean special rights, kid. And the definition of marriage is between a man and a woman.
Now, maybe your mommy and her girlfriend can start a movement for gays to create another entity...like a 'damirion', and that can be a legal union between whatever and whomever they want, and maybe the laws could get changed and we can have 'damirion' ceremonies, or something.
But marriage...it's pretty clear two women don't qualify, just like I don't qualify for a minority scholarship because I don't fit the definition of "minority".