Modern: Jack's son
Historical (or like in Game of Thrones): son of Jack (usually to describe or attribute lineage). For example,
1This is the genealogy of Jesus the Messiah the son of David, the son of Abraham:
2 Abraham was the father of Isaac,
Isaac the father of Jacob,
Jacob the father of Judah and his brothers,
3 Judah the father of Perez and Zerah, whose mother was Tamar,
Perez the father of Hezron,
Hezron the father of Ram [Matthew 1-3]