Hi Kristina!
Hollywood & Vine is a really fun Character Dining experience. As the mom to little ones, it's so much fun to enjoy the restaurant's Disney Junior Play 'n Dine, where you can meet Disney Junior Characters while enjoying a tasty buffet breakfast. Your dining reservation and the cost of your meal do not include theme park admission, which is a requirement for enjoying a meal at a restaurant inside one of the theme parks. So if your son's great-grandmother and great-aunt are not planning on purchasing theme park tickets for the day, they will not be able to enjoy this Character breakfast.
You have a few options so you can include everyone in the family in your plans. You can look at changing your reservations to a Character dining experience outside of a theme park so everyone can enjoy them without theme park tickets. I recommend breakfast at either
Trattoria al Forno or
Cape May Cafe, which are both fantastic dining experiences with fun Character interactions and since they are located on
Disney's BoardWalk, they are convenient for your day at Disney's Hollywood Studios. Alternatively, you could purchase one-day theme park tickets to Disney's Hollywood Studios and include everyone in your theme park day. If your family members are concerned about walking through the theme park, you could
rent them an ECV, or electric conveyance vehicle, to help them get around during the day.
Let us know if you have additional questions! T-T-F-N, ta ta for now!
~Crystal