first of all welcome to the list .
all right then, enough of that , down to business.
getting two dogs , especially the same gender, from one litter , is a recipe for problems , and a recipe for a less than satisfactory human to dog bond and relationship.
two GSD that are competitive and not compatible , initiating fights and a senior pit mix -- sounds to be like an open canister of fuel and the lit match falling through the air about to connect and then - bam .
young dogs need discipline , which is not putting them down till they submit. You see that does not work. The issue with being competitive with each other is not about you . That dynamic is between the two dogs .
You are lying down with the dog and then acting like a dog and I would watch that they don't put you in the middle.
and I would watch out that the pit doesn't get suckered in and you have a three or four way bloody fight that you can't control physically and can't control at all because it is in a heated emotional state with dogs in a different unreachable zone determined to win.
solution - choose one of the male pups and find a great home for the other
enroll in some obedience class . Become the leader . Discipline is what gives security and harmony which any group living being , humans, dogs, horses thrive in . Discipline is not bootstrap follow orders. It is a guide to what is expected , what is rewarding , what will be redirected.
at the moment it sounds like you have a pack of dogs living in a house and you are a member, it is their house , while it should be you have a home that you share with your dogs .
so the discussion begins