Family Property Dispute

[Louis W.]

Hi all,

Not sure if this topic is at the right forum. Please forgive me if not. 

Currently, my sister and brother are claiming that they own part of my house. Two years ago, my father passed away, and he uses to live with me at my house. Many years ago, my father gave me money for half the down payment for the mortgage. My father didn't say that he is lending me the money, he just gave it to me and didn't put his name on the loan or the deed of the house. Now, my siblings claim that my father owns half the house and demand that I sell the house and give them half the money. My father didn't leave a will and we already split his bank account three ways after he passed. I don't know how to deal with my siblings making these new demands two years later. They also claim that my father helps me purchase another investment property oversea, which 10x in value and my father didn't give me any money for that purchase, and demand money for that too. What should I do about this?