Is a husband's divorce of his wife valid if he was coerced into it due to family problems resulting from his second marriage without his first wife's knowledge, and pressure from the second wife's family?

A husband divorcing his wife due to the insistence of his first wife and the abundance of problems and pressures is an effective and valid divorce. It is not considered a divorce under duress unless there was genuine duress, such as a threat of death. If the divorce is less than three pronouncements, he can take her back before the expiration of her iddah (waiting period) or with a new contract after the expiration of the iddah.