What is the ruling on a man shaking hands with his paternal uncle's wife, who was previously considered forbidden to him by fosterage according to the Maliki school, but he later became convinced of the necessity of five sucklings for prohibition, which makes them not forbidden to each other, and how can he avoid shaking hands with her and the awkwardness that might arise?

If you are qualified to examine the sayings of the scholars, and it becomes clear to you that the opinion of the Malikis is weak in this matter, and that the preponderant view regarding prohibitive suckling is five sucklings, then do not shake hands with anyone who has not met the conditions of this suckling under any justification. If you are not qualified, then what is fatwa-ed by us is that the common person who encounters differing opinions among scholars should adopt the view of whomever he believes to be the most knowledgeable and trustworthy among them. Otherwise, he should adopt the easier opinion, because Islamic law is built upon ease. And if you adopt the more cautious opinion, it is more absolving for the conscience.