Here are a few quotes from different perspectives:
Child of same-sex couple: Heather Barwick
“I’m writing to you because I’m letting myself out of the closet: I don’t support gay marriage. But it might not be for the reasons that you think. It’s not because you’re gay. I love you, so much. It’s because of the nature of the same-sex relationship itself ... same-sex marriage and parenting withholds either a mother or father from a child while telling him or her that it doesn’t matter. That it’s all the same. But it’s not. A lot of us, a lot of your kids, are hurting. My father’s absence created a huge hole in me, and I ached every day for a dad. I loved my mum’s partner, but another mum could never have replaced the father I lost."
Quote from Georgetown law library
“No union is more profound than marriage, for it embodies the highest ideals of love, fidelity, devotion, sacrifice, and family. In forming a marital union, two people become something greater than once they were. As some of the petitioners in these cases demonstrate, marriage embodies a love that may endure even past death. It would misunderstand these men and women to say they disrespect the idea of marriage. Their plea is that they do respect it, respect it so deeply that they seek to find its fulfilment for themselves”