One of the most popular kid-friendly titles ever is the Hero Kids series from Hero Forge Games. Their latest releases for space adventures are already slamming the top of the DriveThruRPG charts.
Like this one, Trouble at Threshold Station.
The Trouble At Threshold Station adventure finds the kids travelling Threshold Station, a trading station in orbit above Circa Prime, avoiding a deadly meteor shower, then attempting to sell spare parts to a merchant. However, once the trade is complete the kids are ambushed by raiders and must fight to escape.
• Adventure with four encounters and three new maps
• Includes four monsters: Raider leader, sawblade raider, gauss-gun raider, and stunner raider