Mum needs Henry to get heat protection before they can deal with the Furnace. If you have seen what you need but can't reach it, use hints for dealing with that character.
You have already seen the item you need, earlier in the story. You may see it again, as you explore new locations.
The item you need is on New Callisto.
Head to the Sunstone Pyramid. (Wrangler will let you ride there on Dorothy.) If you can't ride Dorothy, use the hints for getting a ride from Dorothy.
The Dockworker is half-way up the pyramid, with their Heat-Proof Parasol.
Use the hints for dealing with the Dockworker.
Do you have anything in your inventory that is long and grabby? (A few things need to happen before you can get it, so you may wish to come back to this puzzle later.)
Have you explored all of the locations you were at before?
The item you need is on Cape Coocoo.
It's on the Party-Bot, in the Alleyway behind Ye Olde Coocoo.
You need to know a helpful voice command.
Go inside Ye Olde Coocoo. Bruce has left some old Space Mags.
After touching the Space Mags, Henry will take a Party-Bot manual. Examine it in the eye section of your inventory.
Try out the new commands on the Party-Bot in the Alleyway.
Use the SNOOZE command. The Party-Bot will give you its arm.
You can use the Party-Bot Arm to get the Parasol.