Originally Posted by LisaB4657
Your first question depends on the way in which your parents are listed on the deed. If they are listed as "John and Jane, husband and wife (or h/w)" then they own the house as joint tenants with the right of survivorship. This is the most common for married couples. If one of them dies then 100% of the ownership passes to the other one. If they both die then the property passes to their heirs according to the laws of intestacy. In NJ that would mean that you and your sister would each own 50%.
With regard to your second question, the only way that you would have 100% ownership of the house is if you and your mother own the property as "joint tenants with right of survivorship". You would have to make sure that the deed contains this specific language. If not then it will be presumed to be "tenants in common" which means that your mother's share would pass to her estate after she dies, rather than going to you. That would mean that you would own 50% and the other half would be owned by your father.
I suggest that you and your parents meet with an attorney to discuss the preparation of wills and deeds. An estate attorney would be best since they can probably advise you about taxes.