If a Goy converted with his wife, he remains with her on condition that her Kesuvah will be valid.

**********הדרן עלך הכותב**********

If a man married a woman and she died, he then married a second woman and he died, the second woman collect before the heirs of the first wife.

If a man owed money to two creditors and the latter collected his debt before the former, the collection stands.

כתובת בנין דכרין can not be collected from land the father sold.

כתובת בנין דכרין applies even when the husband dies in the middle of the two wives deaths.