Should a husband divorce his wife if his wife's grandmother breastfed him for two years, making him her brother through suckling?

The gist of the fatwa: The preponderant opinion among scholars is that the testimony of a single woman regarding breastfeeding is acceptable, both before and after marriage. Therefore, your marriage is invalid. However, it wards off the hadd punishment and legitimizes the child, due to your belief in the validity of the marriage. As for the other opinion, the marriage is considered valid because breastfeeding is not established by the testimony of a single woman, but this is a less favored opinion. We advise referring to the Sharia courts.