I'm sitting here while Delos is playing with his stacking toy and he loves when he puts on there, we…

I'm sitting here while Delos is playing with his stacking toy and he loves when he puts on there, we cheer yay and clap for him. He claps too and gets a big smile. My father in law is sitting here too watching him but instead of cheering him on the way Delos loves, he says "good job" and "is that 'insert color here'". It upset me because I sat there and told him how we play the game. Don't change it because Delos made up the game and we have to cheer him on the way he loves.