My son is 15. 16 in a couple of months. He hasn't seen his mothers since he was maybe 5. And me and my wife(his step mom) were wondering if there is anyway she could adopt him. So if anything was to happen to me she would get him? We live in gidgee

Is he your son or step-son? In the title to you post you say "my stepson", but in the body of it you say "my son".

Is this Gidgee the mine in Western Australia?