Mario Odyssey.
I have a Switch, and I'm not into it as much as the Xbox/PS4, but that game is legit. It easily exceeded my expectations and I think it's fun + simple enough for kids.
Mario Tennis Aces might be a good choice too. I don't have that one, but I have the Wii U version, and this one is an improved version of that, so should be decent for kids.
If they like RPG, then maybe Zelda: BOTW or Octopath Traveler. Or you could go with with Let's Go Eevee or Pikachu. If they want something a bit more for kids, then maybe Splatoon 2.
I have a Switch, and I'm not into it as much as the Xbox/PS4, but that game is legit. It easily exceeded my expectations and I think it's fun + simple enough for kids.
Mario Tennis Aces might be a good choice too. I don't have that one, but I have the Wii U version, and this one is an improved version of that, so should be decent for kids.
If they like RPG, then maybe Zelda: BOTW or Octopath Traveler. Or you could go with with Let's Go Eevee or Pikachu. If they want something a bit more for kids, then maybe Splatoon 2.