My parents died and never left a will to the children. Its been about 30 years, can i switch the house into my name?

The house was supposed to go to the heirs of your parents through a probate action.  That would probably be their children, including you and your brothers and sisters.  Just because you've lived in the house, doesn't mean that you are entitled to all of it.  There is such a thing as adverse possession, but I don't think that you meet the qualifications.  You should initiate a probate action to transfer the house to the heirs, including all of your siblilngs.  If any of your siblings do no want their share, then they can disclaim their interest.