Disowning Family Members

Sorry to hear this, money does funny things. Your folks are the ones who should have written their will differently but probably this was accepted as plenty good when they had it drawn up. If you have any net worth it is really a chore to keep up with ever changing tax laws that can really affect an estate, keep your chin up!
From the outside this would seem to be true, but here is the problem. A very respected attorney in estate law drew up the will and trust for this estate. If a trustee turns rogue after the power of attorney is passed to him or her and the owner is deceased the beneficiaries can get hosed. I hired a retired judge that went back into estate law with a degree from the University of Illinois Champaign who was our neighbor and friend to our mother. With his help I was lucky to get out of it as good as I did. Trustees wield too much power with an inadequate legal system of checks and balances if they do not follow the will and or trust. If the trustee is honest and honors his/her fiduciary responsibilities to the beneficiaries / beneficiary it is not a problem. If there are 2 beneficiaries and one is the trustee, the lone beneficiary has no chance because there is no majority of people to out vote the beneficiary/trustee. If this person becomes dishonest it is a huge uphill battle for the lone beneficiary!