Do you really mean “syncing” (keeping the data the same on two devices), or do you really mean “migrating” (moving to a new device), which seems much more likely? As you consider the answer, please realize an Apple Account should be used by exactly one person.
Make sure that each family member has a unique Apple Account - Apple Support
Birck Cox wrote:
Can files and apps from the mini function. on the iPad Pro?
Apps become obsolete. Developers may stop supporting them. They may no longer be offered in the App Store. Your iPad Pro can only use apps available in the App Store when it is set up.
Set up your iPhone or iPad - Apple Support
How to find out more about it?
iCloud User Guide - Apple Support