I’ve read most of this whole thread and am so tired of all the rules and regulations in it. Didn’t Jesus condemn those who only lived by the law but had no charity and compassion for others? Where is the charity and compassion in trying to usurp parents?
For the OP. When you married a woman who had very devout Catholic parents what did you think would happen? Didn’t you know they would talk about their faith to their grandchildren? If you had married a women whose parents were devout Jews or Muslims or Protestants wouldn’t you expect them to do the same thing?This isn’t talking about their faith, this is a deceitful and underhanded baptism. If your in-laws were Muslim, I can assure you that you would not be ok with them attempting to induct the children that you are trying to raise Catholic into the Muslim faith. Also, I have Catholic in-laws. They will be allowed to discuss their faith, but if it crosses the line into evangelization and they refuse to stop, they will lose contact with my child.
For those people who suggested bringing in a lawyer or drag the grandparents to a counselor, do you really want to spend a small fortune and start a war? How crazy is that, over religion?I mentioned the lawyer, but only to keep the baby’s name off of the church records. Not to do anything to the grandparents.
I don’t know what religion you are since you didn’t want to say but if you are secular, why are you so upset? Baptism means nothing to you and your daughter will pick up on that. I am sure your wife’s parents have been praying for her to return to her faith from the time she left and now that she has had a child I am sure they are praying she will come back and bring her family as well. NO. You don’t get to decide what baptism means to the OP. That’s completely up to him. As far as I’m concerned, while spiritually baptism is meaningless, the fact that my child’s name would be on church records and the fact that the grandparents went behind the parents back are both far from meaningless. That’s not to say the OP feels that way though, as I said, that’s up to him.
You say they confirmed they did baptize your daughter, probably since they see their daughter has no thoughts of returning to her faith and getting her child baptized they decided to do it for the fear of Original Sin. If you don’t know about Original Sin you can do a search on it. The parents are probably old school and believe that way and had no thoughts of anything else religion wise for your daughter.
They know they cannot raise her Catholic or take her for her first Communion. The parents would surely be involved in those sacraments and the church would need the parents involvement. Your daughter is bright and would talk about her parents and tell you what is happening.
My advice is to drop this whole thing or your daughter will feel the tension. You have stated your position to the parents and that is all you can do. If you think you will stop devout Catholic people from talking about their religion or praying in front of your daughter then you don’t know about life. The same for Jews or Muslims or Protestants, etc. If he drops the whole thing, there’s really no telling what else the grandparents might think they know best on. You wouldn’t tell a Catholic to drop it if a gay person tried to get their child into an LGBT organization, so please stop patronizing the OP.
I think it is silly the grandparents now need your supervision all the time. Then don’t send your daughter to school, I assure she will see and hear much worse at school, You will need to home school her. Who exactly would baptize his child at school?
If you still want to be controlling and can’t get over this I see a divorce in your future. Your wife’s parents will always be her parents and we all need to accept our in-laws. I am sure we can all tell you stories about in-laws and how we need to go along to get along. No reason to start a war over this, I am sure that is how Jesus would want it. Peace in families is the most important thing.
Did you really just say that???

He’s going to be divorced if he doesn’t let his in-laws do whatever they want to his child? Guess what, he and his wife are on the same page, and even if they weren’t, she cannot take the side of her parents over him. If they divorced over this it would be the wife’s fault. And peace in families is not the most important thing, ever. Would you let a gay couple have unsupervised access to your child to keep the peace? I highly doubt it. The religious upbringing of a child is not something that you need to “go along to get along” on. EVER. He accepts his in-laws, and he is not going to war. They can still see the child anytime they want.