He was the son of a multi-
When he returned to Sāvatthi, after having paid homage to the Buddha, he spent the noonday under a tree. His parents, hearing of his arrival, went to see him. Their efforts to persuade him to return to lay life were too insistent, and he would not even speak to them. They returned discomfited and sent his wife and son to him. His wife appealed to him with various arguments, but he refused even to look at her. She then placed the child on his lap and went away. When she discovered that Saṅgāmaji would not even talk to his son, she took him away, saying that her husband was a useless man.
The Buddha saw all this with his divine-
Posiya Thera was Saṅgāmaji’s younger brother. ThagA.i.97.