Hi, Laura! We've been to a couple of Braves' games at the ESPN Wide World of Sports Complex, and in my opinion, it's one of the most beautiful and accessible Spring training sites there is. However, there really aren't any "combo deals" for park tickets and accommodations. Your Braves' Spring Training ticket does allow you full access to the WWofS complex and its activities and events for the day. You'll want to click onto the
ESPN Wide World of Sports site for the specifics about Champion Stadium (where the Braves' play) and the variety of tickets and experiences offered for the game(s) you're attending. (There are several add-on's...one which can get you on the field during warm-ups!)
Also, you'll want to check out the schedule of amateur sports which may be played while you're there...they're worth taking the time to watch before or after your Braves' game. If you have children and they'll be attending the game with your parents, you'll want to make sure that they bring their gloves to catch fly balls and stay until the end of the game to run the bases! Lastly, parking at the complex is free but can be far away depending on the events hosted at the complex that day. So, if you happen to be staying at a Disney Value Resort or the Caribbean Beach Resort with direct bus transportation, this may be a better option for getting back and forth to the WWoS complex. I hope this helps with your information gathering for your parents. Have a wonderful day and a magical vacation!