@wrrydmom If he says “this” then I would just reply in Spanish. (“Ahh, this? This is an apple!” Etc.) So you’re not necessarily correcting him, but you still communicate how to say “this” in Spanish.
@qian Mine isn’t interested in books either, so I narrate what I do whenever I carry my baby around the house. “Let’s do the dishes now! Here’s the water! Water. Wow, it’s water!”