Hi, Sheldon! Any character meal can be turned into a birthday celebration!
Chef Mickey's at the Contemporary is the perfect place for celebrating. When you make your Advance Dining Reservations 90 days prior at (407)WDW-DINE, let them know you have 2 birthdays. They will make a note on your reservation and they usually present a special sweet treat to those celebrating. While there are plenty of desserts offered at the buffet, you can order a mini-cake to be brought to your table, just let them know at the podium when checking in. The cakes are about $15. Sometime during your meal, the music comes on, and everyone is encouraged to sing and dance as Mickey, Minnie, Goofy, and the whole gang come out to party!
If Mickey and Pals aren't your thing, a similar experience takes place at the Crystal Palace in the Magic Kingdom with Pooh, Tigger, and friends.
I hope your mom and son have wonderful birthdays! Make sure your mom signs up
HERE for her free birthday park admission ticket and pick up free Happy Birthday buttons at guest services. Enjoy!