This is OUR baby

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So my wife has battled with her mother since the beginning of time about her lesbianism. It was even more of a challenge when we got married. She still doesn't "like it", but has learned to deal with me and her daughter being together. Since last year, we have been TTC with a known donor. We finally got out BFP last month. I'm currently 7w4d along with our first baby together. We have 5 total combined from previous relationships. He will have no responsibility or obligations to the baby. A contract has been signed and notarized. All 3 of us are in agreement. This is my wife and I's baby. Nobody else's. Well we finally told her mother that we were expecting (not the easiest as you can imagine). She took as we expected. She started telling saying that we aren't supposed to be together. It's not my wife's baby, it's mine and the donors baby. And all other types of other hurtful things. It got my wife to crying because this is supposed to be a happy time in our lives, WE ARE HAVING A BABY. And the fact that her own mother is saying such mean things. I'm so lost on what to do or say to my wife to comfort her. That is her mother so I don't want to disrespect her by saying how I really feel but at the same time, this is my wife and I will defend her. I don't want her to dwell on this and just be happy but I know it's not that simple. I'm so angry at my mother in law. I want to hate her for her harsh words but then again, I love her for giving birth to my wife. I'm so irritated.