DD's friend told my DD that she thinks her Mum is having an affair. Mum is a friend of mine, and actually , I think that might be the case (but don't know for sure, just confirms some very strange behaviour ).
Common sense tells me to keep out of it... but on the other hand, I wonder if friend should know that her DD (young teenager) is suspecting this - I think friend has no idea that her DD and siblings (and possibly DH) have this suspicion