They're not letting me see my father who just had a ischemic stroke. Before my father's wife Anna found out that she is dying. She called two of her daughters and her favorite grand daughter Stephanie with two small kids to meet with them at their house. Anna told my father that she wants Stephanie and her two small kids to move in and imposed on her two daughters to be my father's caretakers. They did this without me and my sister knowing what's going on(we are the biological children ) After my father's wife died. My Dad and my uncle Mike paid for her burial. Dad inherited the house...well, the house is in both name. Since then those Step sisters keep coming to my dad's house a lot. We the biological kids hate that family! I'm like what happened to "Death do us apart".All they caused stress and confusion for my dad! I feel that I shouldn't compete for my dad. He is my father! They have their own father. I asked them not to be around my dad or at dad's house when I am visiting him. They can not respect this! They must be around and causing problems. They are the trigger to this problems. Can I sue them?