Hey there Angel,
Welcome to planDisney and thank you for your question! It sounds like you have become the chief planner for your family's upcoming trip - you're in good company with the rest of us here at planDisney!
Typically, when I'm planning a trip with family, I'm usually the one who takes the lead in
booking hotels, purchasing
theme park tickets, and making
theme park reservations for our group. I'm a huge fan of the
Disneyland Resort mobile app because after I've confirmed all the trip logistics then I can have the others in my group link their tickets through their own Disney account in the mobile app.
My recommendation for you would be to purchase your family's tickets then you can have each family member link their own ticket in their Disneyland Resort mobile app. After you purchase the tickets, they should show up in your mobile app. Then, you'll want to have each member of your family open their mobile app, tap the menu button (the three horizontal lines) then select "My Tickets & Passes." Next, they'll need to tap "Link Tickets & Passes," and then can use their phone's camera to scan their ticket barcode.
Once they've linked their ticket, it'll make it easy for them to pull it up when you're scanning into the parks. Additionally, if you all purchase
Lightning Lane Multi Pass then anyone in your group will be able to make Lightning Lane return time selections for the whole group.
I hope that helps, Angel! I hope you have a terrific time visiting the Happiest Place on Earth with your family.
Have a Magical Day,
Greg