Question about going forth (while having children & wife)
When Rahula was born the Buddhisattava was contemplating to renouncing a householder's life hence he said "rāhulajāto bandhanaṃ jātaṃ", meaning "A rāhu is born, a fetter has arisen".

So a kid and a wife bind you to with the burden of responsibility. There were many monks who left householders life with families to become monks at the time of the Buddha. Even now in Buddhist countries, this happens.

Going forth is leaving aside ones household responsibilities to wife, children, parents, relatives and friends, so that one is free from these responsibilities, hence having more time to practice the dhamma.