Grandma got roped in

Dylan went to grandmas for a few days. His first time away from home without any parents or siblings. Grandma took him to the store and Dylan sees a Dinosaur that was bigger than the ones he usually gets. He looks at grandma and insists he just has to have it. HE DOES NOT HAVE THIS ONE!!! Grandma wonders because she know that his mom buys him lots of dinosaurs. HE says "I know what dinosuars I have I DO NOT have this one". Grandma gives in and gets it for him. He comes home shows it mom and I said "Dylan you have that dinosaur" he says I know but grandma doesn't I wanted the bigger one because I only have baby ones and so this one can be the daddy one. DO NOT TELL GRANDMA. I said well I should probably tell grandma and dylan the little snot he is says "If you tell on me I will just tell grandma you said she is a devil". (This came from the conversation that mom on the phone is 666)Though he is a joy in our lives it made me realize even at 5 yrs. old he still knows how to get what he wants and to play the system.