Will sleeping with my son's wife have a negative effect on our relationship?

I'm relatively new to Crusader Kings 2 and have started as the King of Munster. My first act was to find suitable wives for both myself and my Son and Heir. As my main aim was to expand the family as quickly as possible, I chose potential wives with positive fertility attributes. So I've ended up with a couple of lustful, hedonistic princesses. In other words, they like to fool around.

Anyway, I soon ended up with an event (which I admit I didn't read thoroughly) which saw me having a bit of a late night tussle with my Son's wife. She became my lover and a few weeks later she announced that she's pregnant with my child and suddenly my Crusader Kings game starts to feel like a bad Jerry Springer episode!

My Son is none the wiser and thinks the Child is his. However, should I be worried that some time down the line he's going to find out and our relations are going to suffer as a result? I've no idea what would happen to the line of succession if he did find out. Would the child move to become mine in the family tree?

I tried to Google the answer, which brought up some interesting sites but none relevant to Crusader Kings 2!