Then she had ¹  yet another son, whom she named Shelah. She gave birth to him in Kezib. ² 

Judah recognized them and said, “She is more upright ¹  than I am, because I wouldn’t give her to Shelah my son.” He did not have sexual relations with her ²  again.

The sons of Judah: Er, Onan, Shelah, Perez, and Zerah (but Er and Onan died in the land of Canaan). The sons of Perez were Hezron and Hamul.

Then Judah said to his daughter-in-law Tamar, “Live as a widow in your father’s house until Shelah my son grows up.” For he thought, ¹  “I don’t want him to die like his brothers.” ²  So Tamar went and lived in her father’s house.

So she removed her widow’s clothes and covered herself with a veil. She wrapped herself and sat at the entrance to Enaim which is on the way to Timnah. (She did this because ¹  she saw that she had not been given to Shelah as a wife, even though he had now grown up.) ²