What would a 11 year old boy play with his mom?

I can only answer my way,As a 11 yr old boy,i played with my Mom,and she played with me on several occassions,and i have deep and fond memories of those years too,our "Play" was of the taboo nature,as to your question,i don't exactly have a quick answer,i suppose there would be many games they could play with each other.