I hope I'm not opening a can of worms but....

I have a question about the lineage of Jeasus. Or maybe an explanation.

Abraham father of Isaac. etc. etc. father of, father of, until Joseph the husband of Mary.

It's all genetics up to Joseph but not the father of Jeasus. Jeasus considered Joseph to be his earthly father. How did the Jews reconcile Joseph being a step father and still part of Jeasus's lineage?