What I Saw

Its about what I saw, we are a family of four, my brother was home on leave from the navy my dad had previously served in, it was Saturday morning he had arrived home on the Saturday it was mid morning mum was in the garden I was about to go out I got to the door and turned back for something, its what I saw when stopped to text as I was passing the kitchen, my brother was sat at the table after a late breakfast my dad was stood next to him talking about the navy. They had there backs to me, what I saw was a shock, dad was wearing his shorts my brother put his hand on dads leg nearly at the top sliding it up and down I thought that's strange thing to do, he next put his hand up dads shorts and was feeling his bottom dad parted his legs a bit he next unzipped his dads shorts.
I couldent look any more and crept out of the house. I have herd of brother and sister relations, but this is a strange one, should I tell mum I think she should know, my dad and brother go off a lot together, I still can not believe what I saw, I am still undecided weather or not to say anything. may be it was just a bit of fun