Press 3th party claim and have them become a vassal?

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?
Best Answer
There are a few options:
Have them as a landed vassal already. If they are going to get a kingdom out of the claim, you will need them to be a king vassal already (even if you are an emperor), if they are only a duke or lower they will become independent (if 2 is not met)
Have them be a member of your dynasty. if you press a dynasty member's claim, they will automatically becomes your vassal (if lower rank).
Have their lands pass to your control. Ensure their heir will be your vassal. Generally you use this option instead of 1 only if the claimant is a female you can't land
Have their lands pass to someone you will control. This is different from 3 only in the fact that this is, as far as I know, the only way to press a claim of same rank to any use. For example, if you use the other 3 options for an empire, it will always end up outside of your control. Thus, you need to ensure the empire will be claimed by someone will pass it to a character you are current playing as. This generally means marrying a woman with a claim and pressing it so your shared heir will have both your lands. This is the only way to gain an entire empire at once I think.
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