Alwaysintheway
The most important thing I learnt was not to punish or lock horns. No-one wins. The other is to send out the message, loud and clear, that you love them but hate the behaviour.
Would he be amenable to a conversation with you? Like going bowling together and having an informal chat? I stated, over and over, how I felt and which behaviour I didn’t want. I also said that as my dd was an adult she doesn’t have to live at home, as much as I would miss her if she went.
I found calm, loving conversations were productive but it seemed important to my dd for us to listen to her too. She shared that she was struggling mentally and, in a way was acting out - a bit like a toddler would. Once I understood that it was easier to manage.
As I said before though, it was not a sudden fix and we had the same chat over and over. BUT she is still at home and is now respecting our boundaries 90% of the time and I am ok with that as I am not perfect either.
Stay calm, remember you love them and listen to them. (That’s it in a nutshell for me). It’s a marathon not a sprint.
Oh, and I felt like a failure as I felt like the only parent going through this. However, it’s more common than we think and sticking with them and working it out makes us the good enough parents, not the ones who never have the issues.
My relationship with my dd is fantastic now, and two years after the hellish behaviour she apologised to me. That was a moment!!
Good luck.