At this time, can I have the max pass on my phone only, but have my children apply their photos to my account? (Like we used to with the paper photopass slips?)
Yes. If they are separate from you, have them get a photo pass card, then link the card to your Maxpass. If they have numbers for ride pictures, they just need to give those to you and you can enter it. We all have Maxpass, but all the photos are on my account for simplicity.