I read much of your material on the 12 tribes of Jews. Some of us have Jewish blood which we were not aware of. Some were raised Christian and yet have discovered Jewish ancestors. Some of these ancestors may have come from the original 12 tribes and some may have been converts. I am pretty sure I am one of these, way way back. So many of us are “partly Jewish” even though we are fully Christian.
And my half-Jewish husband, who was also “born again”, is part of the Church already in Heaven, even though he knew positively of his Jewish roots and even of which tribes his ancestors came from (Judah and Levi). I would assume that he is not among the “tribes of Israel” who will be identified in the last days?
Some have speculated that Christians who are especially attuned to Israel may have some Jewish blood from the distant past circulating through their veins. There’s no way to know for sure but it’s an interesting thought.
As for your husband, according to Gal 3:28, once a person is born again it doesn’t matter what his or her biological origin is. In Christ there is neither Jew nor Gentile. I believe Paul taught that in God’s eyes the Church is also unique race, taken from among both Jews and Gentiles but no longer considered to be either (Ephes. 2:15, 1 Cor. 10:32).