Is a man required to divorce his wife after 20 years and having 5 children, if it becomes apparent that he was breastfed by her mother?

If it is established that a man has been suckled by his wife's mother five times or more, then he becomes a brother to his wife through suckling, and he must separate from her; because suckling prohibits what lineage prohibits. If there is doubt about the number of sucklings, he should separate from her as a precaution. In both cases, the children are attributed to him.