The best thing you could do is stop contact and move on. There are worse things in the world than not having a father or getting whatever inheritance he had.
You have a lot of anger towards him. IMO you should also work on forgiving your father, so you don't have to carry thing around for years to come.
not worried about any inheritance. If he leaves her i think i can forgive him eventually
You're not getting it. You need to move on and let what happens, happens. If he dies and your brothers get all the inheritance, you need to be fine with that.
He's not good for you or your son. He doesn't understand the meaning of respect. Do you really think that he's changed his position on dogs, or was that just a shot at you and your allergic son?
He's a cancer in your life. Remove the cancer and live free of it.