Thanks for being a part of Apple Support Communities.
If I understand your post correctly, you are wanting to give your iPad to your son, but you're worried about losing your iCloud data if you erase the iPad. It's a good idea to erase the device before you give it to your son. The iCloud data will be erased from the device, but only the device. It will remain on the iCloud server. Take a look at this article for help with erasing your device before giving it to your son: