If you learn how to get him on board please let me know how you did it as I could never get my wife on board with my idea of parenting, since I was determined as hell I had to learn to put out a very disproportionate amount of effort in their activities. My example for that is I hardly ever saw her make a normal conversation with the kids, she would constantly lecture, criticize, nag yell and argue with them and was on the verge of destroying her relationship with them. I told her thousands of time to just have a normal conversation, show interest in their lives, don’t judge or compare. She is finally changing her ways and has a healthy relationship with children.
I had to do most activities with them myself and take control of the direction. It was overwhelming and now she totally agrees that I was right. Up to this day her eldest brother in law was judgmental about my parenting and that made me upset and I let him have it.