I'm already starting to think about gifts from Santa for New Year's and birthdays. Both holidays are…

I'm already starting to think about gifts from Santa for New Year's and birthdays. Both holidays are in winter, in January. There isn't much time left, but it's a tough task. My oldest will turn 10 – he has everything, and I have no ideas. He loves to sing (he has a microphone), build with programmable LEGOs (he has those too), and space (he has a "starry sky" night light, astronaut toys are a thing of the past, he asked for a telescope, but the kid-friendly one only magnifies a little – maybe enough to see the moon up close, and a real one is too expensive, we don't have the funds). Can you suggest anything else? Just no gadgets. My youngest will be 4. He likes dinosaurs and police, and has tons of toy cars. He already has the wooden IKEA kitchen, and he's not a big fan of building blocks. Maybe something educational? For logic, thinking skills, that would be age-appropriate and interesting?