Welcome back to the Disney Parks Moms Panel, Jessica. I hope you're having a magical day.
For your Disneyland Resort vacation package, I believe you're able to have someone else take the place of another family member, so long as the credit card holder who made the reservation will be present during check-in. I would definitely give a quick call to your travel agent or the Disneyland Resort Vacation Package help center at (714) 520-5060 just to be sure.
Once your multi-day or Park Hopper
theme park tickets have been activated at the entrance of Disneyland Park or Disney California Adventure Park, a photo of the Guest is taken. You'll not be able to transfer the ticket to another person once the photo has been taken. Since your arrival date isn't until July, you'll shouldn't encounter issues with this.
I hope this information is helpful for you. I wish you and your family an unforgettable trip to the Happiest Place on Earth, Jessica. Feel free to swing by the Panel if you have further questions.
Sending you Pixie Dust,
Kiki