Yes, both parents can and should use the Disneyland (or My Disney Experience) app simultaneously to manage the family's trip. To do this effectively, each parent should create their own unique Disney account. Then, they can use the "Family & Friends" feature to link their accounts together. Once linked, one parent can "share" the tickets and reservations with the other. This allows both parents to see the same itinerary, join virtual queues together, book Lightning Lane entries for the whole group, and view "PhotoPass" pictures. Alternatively, some families choose to have both parents log into the same account on two different phones; while this works for basic viewing, having separate linked accounts is the more stable way to ensure that both people can independently manage mobile food orders or individual Genie+ selections without technical glitches.