4
Tamar was Judah's daughter-in-law. She had Perez and Zerah by him. The total number of Judah's sons was five.
1 Chronicles 2:4 Meaning and Commentary
1 Chronicles 2:4
And Tamar his daughter in law bare him Pharez and Zerah Through incest; they were twins, ( Genesis 38:27-30 ) all the sons of Judah were five; who are before mentioned by name.
3
The sons of Judah: Er, Onan and Shelah. These three were born to him by a Canaanite woman, the daughter of Shua. Er, Judah’s firstborn, was wicked in the LORD’s sight; so the LORD put him to death.
4
Judah’s daughter-in-law Tamar bore Perez and Zerah to Judah. He had five sons in all.