Disagreement on school? Am I wrong for feeling annoyed?

My son starts school next year, and in ten days we put in our applications.Two years ago, myself and my now ex partner visited local schools and came to a decision about where we wanted to send him.Yesterday on the phone, I mentioned applications, and my son’s father responded that we needed to talk about schools as his mum wasn’t happy which one we had picked as it’s “more of a detour” if she ever needed to collect him.Now, we do rely on her for childcare maybe 1-2 times a month, nothing regularly set up, just dependent on when we are working. However, I don’t feel this is a reason to change our minds about schools.The school we picked is by far the best, both in terms of curriculum, teaching standards, and the school and grounds itself. I have also checked, and it is no further from her house than the school she wants us to pick.Am I in the wrong saying she has no right to decide where I send my son to school? If I had picked a school further away I’d understand, but they’re in the same village, within half a mile of each other.My ex won’t say anything because he’s such a mamas boy, which contributed to a lot of the problems we had when we were together, and I don’t want to cause an argument that could impact my sons relationship with his grandma.TL:DR Son’s paternal grandma has butted in about school choices, and my ex partner has changed his mind ten days before applying because of this. via /r/Parenting https://ift.tt/2CW7b7w