How can I claim property that my dad left us?

Hello, Do I understand that he never adopted you? There are no papers to prove he intended to leave his estate to you? Have you searched for a Will? The problem will be whether you are legitimate"heirs" to him if you were never adopted. You should see an attorney and have your heritage proven or determined in some fashion by the state. There is a case holding somewhere that says nobody dies trulywithout heirs. What you need todo is prove you are his heirs and that was his intention. You'll need a lawyer's help. Good luck.

You have to commence a probate proceeding to claim the proceeds as estate property. The Estate would then collect the proceeds and distribute to the heirs of the estate either according to the will if there is one or by the laws of intestate succession if there is no will.

Each state has a website with very simple instructions to seek unclaimed funds. Go there and follow the instructions and they will take it from there. There is no charge to apply (and do NOT pay anyone to assist).