Do you have to send away your children from an unlawful marriage?
Question:
How about children born from an unlawful marriage? Will repentance require you to send them away, too?
Answer:
"The person who sins will die. The son will not bear the punishment for the father's iniquity, nor will the father bear the punishment for the son's iniquity; the righteousness of the righteous will be upon himself, and the wickedness of the wicked will be upon himself" (Ezekiel 18:20).
Children are not responsible for the bad decisions made by their parents. A child born to a couple committing fornication still needs to be loved and raised. Hopefully, the couple will marry and raise their children together; if not, some arrangement must be made for the children's upbringing. The same goes for a couple committing adultery.
Repentance is not getting rid of the evidence that you sinned, but taking responsibility for the results of your sin.
