My main reason for me coming here and asking those questions in bold was to see if somebody would actually know if my brother and sister could screw me out of what might be mine. QUOTE]
At this point even you have no idea what is or is not supposed to be yours. You haven't checked probate, you don't know what creditors need to be paid off from the sale of the home, you don't know whether there is or is not a will, and what any will states.
Go do your research, find out what is going on with the estate (assets, debts and what probate would allocate to whom) and then come back and talk to us. Children are NOT "automatically" entitled to inherit just because a parent dies.
Example: When my dad died, he had willed his entire estate to my mom (which we all felt was appropriate). When my uncle died, he left out one adult child from inheriting because that child, in his mind, had already recieved more than their share of his assets during his lifetime. He frequently had to help him with self inflicted money problems, drug rehabs, and other problems that the other two never bothered him with. So he felt it fair to divide what was left between the two that never got money from him as adults. It is up to the decedent to choose where their money goes, and whether some or one or no offspring recieve inheritances.
Oh, and if mom is in a nursing home and NOT deceased, they may need to sell the house to pay for HER care, and nobody will get anything from it.