Would you disown me?

My mother is against gay marriage, and I'm bisexual. I see a problem here.

She believes that marriage is for the sake of the children, and that because homosexuals can't have children, they shouldn't be able to get married. It's "to protect the children."

I started to wonder, would she want marriage equality if I wanted to marry a woman? Would she support her own daughter?
Did she get married to dad because she loved him, or because she wanted a child and the best way to protect her would be to marry a man?
Has she never heard of adoption? (which is ironic, because both my siblings are adopted).

For the sake of argument, let's say that marriage is to protect the kids.

Well, homosexual couples are able to adopt. Because marriage puts both parents in custody, only one parent would have custody over an adopted child because they can't get married.
That means if the child ended up in the hospital, only one parent could make decisions about the child's treatments. If that parent weren't around at the time, who knows what the hospital could do?

You might take that as an argument against gay marriage, saying "well, if that's the case, they shouldn't have kids anyway." Who are you to say that? Maybe I think, that because you're narrow-minded, you shouldn't have kids because they'd grow up to be evil. But I don't think that, because everyone has a right to want children.

I want children. Just because I like women, I shouldn't have them?

But, back on-topic, marriage has changed. People don't get married just to protect the children anymore. People get married for the sake of love, money, and taxes. By telling us it's immoral to marry, you're telling us we can't have our own beliefs.
Guess what?
We can't help who we become attracted to. What you say can't change who I love. You could threaten to kill me for being bisexual, and you'd never change my mind, whether I lied or not, because I can't help it.