Who leaves a country packed with ponies to come to a non-pony country?

Willa and Ethan named Grandma Linda's ponies:

• Pink Scooter Skateboard and
• Rocket Satellite

I think they even know which name goes with which pony.

I think I am trouble given how much Willa likes ponies, but fortunately between Linda and Nana, there will be no lack of ponies in her world.