Yes, so beautiful, something I haven't seen anyone mention and maybe I'm remembering wrong is that if percy calls him Kronos he's giving him more power even if he doesn't know it. So even if sally and percy don't know calling them by name gives them power (which I feel like sally would cause she's awesome) wouldn't be better for percy to call him grandpa.
Percy going "Grandpa (derogatory)" about Kronos
That was beautiful