My father passed away last month. He left most asset in a trust for me and my siblings. There were a few assets that he had not yet included in the trust so they must go through probate. My father had a son prior to marrying my mother. He never saw the son but did pay child support until he was 18. My parents did not include him in the trust or will. Can this son make any claim on our estate? Do we need to contact him?