Hi Pamela,
Spending money is always such a personal question. Let me give you some guidelines so you can budget accordingly.
Provided you already have your meals covered, you will want to budget for snacks and drinks which run between $2.50-$5.00 for most items. You can figure out how many you will need each day. If you have not included meals, head over to
Disney Dining and look at menus for the restaurants. This will give you a good estimate of how much meals will cost. Some meals are big and can be split. My husband and I usually do this with counter service meals when we know we will be having a big dinner. You can also pack snack and drinks with you to bring into the park to save money.
You will also need to budget for souvenirs. You can give your sons a set amount they have for the trip ahead of time. We used to give our daughters $25 for the trip and then they had to supplement with their own funds.
I would also budget for unexpected surprises. This includes changes of clothes, ponchos for that surprise rain storm or items you forgot at home but need.
Please write back if you have more specific questions.
Wishing you a magical vacation!
Beth