My sister is living with a friend and they both own the property, when my sister died of cancer, we told to make plans on her asset. Since she moved out of the house due to some reason, she told us to leave the house alone. She did not have any will, now her friend wanted all our (living sister and brothers) to sign her away. We refuse to get involved, she even retained a lawyer and send us a certified mail which I refuse to receive. Is there a way out of this without signing?