I share a 3 family house with my parents who live upstairs. Mom has cancer and dad is aging. Dad was served papers by my sister who is asking for guardianship and all their real estate and financial assets. I have both POA and health proxy which my sister is contesting. Basically, she want's to take over all their assets which are still in their name. what can I do to not only protect myself but their interests? building is in my name as a life estate. Their finances are in my father's name but have me and my sister as the beneficiaries. She is demanding that all their income including rental income which they collect from their 2 and 3 family house be turned over to her.