Legal Question in Real Estate Law in Pennsylvania

I do not understand the question. If your parents created a revocable living trust and if they are still alive, then they can amend the trust. Real property would be in the name of the trust, not in your name or the name of any other beneficiary. If your parents are dead, then what does the trust say? If the property went to you and your siblings, then the trust is irrelevant, provided that the trust deeded the property to all three of you. Assuming that is the case, then you or your brother just cannot remove your sister off of the deed. You would all have to sign as grantors.

If your parents are alive and are incapacitated, then it depends on what the trust says. Generally, trustees have no power to change the trust itself. But read the trust. You should go to a trust lawyer for any changes so that these are properly made.