It's best to have everyone's tickets printed out. You can scan printed tickets from Klook when entering the park and that's actually my preferred way of doing it since smartphone displays are sometimes not bright enough or have other issues.
Historically, you could not scan a ticket from Klook into the app until your ticket was used to enter the park so it was vital to have it available on a second screen or via a paper ticket. This changed in an app update fairly recently so if you appropriately scanned your ticket into the app, you should be able to display your ticket when you enter the park.
You do not need to remove your husband from the group. When doing anything in the park such as getting standby pass, only tickets that have been used to enter the park can be selected so you can have 4 tickets linked to an account but only use 3 of the tickets to obtain standby pass. Obviously, when your husband enters, he likely won't be able to obtain a standby pass for the same time.
It's best to have every single person hold onto their own ticket and scan themselves in so you can be sure that nobody accidentally scans your husband's ticket. It's actually kinda annoying when someone inexperienced fiddles around with scanning multiple tickets on their phone rather than have each person scan themselves because that holds up the line.
