I insist that my adult son mow my large yard because I bought a new land mower.
Is this normal for a father to do ask his son for such a big favor?
No, it's not normal, but he is my son and he never does anything I ask him to do
It is hard to tell an adult son what to do because if they don't want to then they won't do it. And it is normal to feel frustrated about it since you could tell them what to do in the past. But you can talk to them and ask them for favors instead.
I'm not going to stop asking him to do things for me. It's my new favorite hobby.
It is normal to have conflicts with your adult children but when you do you have to realize you can't make them do anything.