Legal Question in Family Law in California

It is not impossible, but not very likely if he did not adopt the child and did not hold the child out as being his. If he let the world believe the child was his and acted as if he was, there is some authority for not letting him just walk away from that upon divorce, but generally a person has no responsibility for step-children upon divorce. There may, however, be INS law on the subject based on his sponsorship. He would have to ask an immigration lawyer about that.