The first time I tried the dining plan, my dd was 9 and I purchased an adult dining plan for her. Prior to that, she'd only eaten chicken fingers at disney, but she's started eating steak and other things, so we tried it. We were DVC members, staying at DVC and had annual passes, so I wasn't buying park tickets, so I didn't have to pay for adult tickets for her. I don't know if you can separate dining and tickets if you/re buying a package. If you can, it's worth it. Or if you can't, it may be worth paying the upcharge for one of your sons and letting everyone share. Back in the day when you got appetizers, 3 meals would have been plenty for 4 of you!!!