I just came to the conclusion that simply pressing someone else claim does not make them a vassal of you but grands them independence, which has been "too" nice of me. So what could I have done to avoid this?
After doing some reading I came to the conclusion that if I had the guy I pressed the claim for already had as a vassal he would remain a vassal of me. So I just had to give him one of my titles? I have several other weak claims from people in my court but I want to make sure I do not lose the title I give to them once I press there claim.
Is this true and are there any other ways to have them become my vassal?