A Bal Tshuva has been married for 15 years and has 5 children. He discovers that his wife’s mother is a convert. His Mother in law converted in South Africa 40 years ago and is not an observant Jew. How can we know that her conversion is real? This Baal Tshuva is not sure now that his wife and children are Jewish. What is the way of the Torah here? Must he ask his wife to undergo a conversion?
He should check it with the records of the South Africa Beth Din, they are very efficient and they would be able to help him.