Henry and Mum are trapped in a bubble.
Look around your surroundings. Interacting with an object will progress the story.
Echo-bot's Remote is just down and to the left of Mum. Interact with it.
Echo-bot's Remote would be useful. What helped you last time you couldn't reach something?
Maari can fly. Interact with Maari.
You need to get rid of Maax somehow, before you can use Maari.
Take a look at Maxx's Personal Displacement Device. It seems to be broken.
Ask her about the portal and she will disappear. (This only works after you have interacted with Maari. It's the same dialogue option, but a different outcome.)
After Maax is gone, use Maari to interact with Echo-bot.
Use Echo-bot's Remote on Henry, from the inventory. Control switches to Echo-bot.