iOS/iPadOS offers no facility to export or directly print saved Passwords/credentials that are saved in your keychain/Passwords App.
Unless you have access to a Mac computer and are signed-in with your own AppleID - you'll not be able to print your saved Passwords.
As is, your only option is to painstakingly copy and paste credentials to a document that you can subsequently print. Note that this manual process is (a) prone to error, and (b) introduces a security risk in that the electronic document containing this sensitive information is potentially vulnerable to compromise.
However, if your Son also uses Apple devices - and has his own Apple Account/AppleID, you can selectively and securely share your Passwords:
Share passwords or passkeys with people you trust on iPad - Apple Support