Hi Linda!
Thanks for your question and for visiting the Disney Parks Moms Panel!
How awesome that you are able to bring you grandchildren to
Walt Disney World Resort!! It is sure to be a most memorable experience for all of you!
Ticket prices fall into three (3) categories...Ages two (2) and under are free, guests ages 3-9 are admitted with a Child ticket and guests 10 and older need an Adult admission ticket. A one day Child tickets can vary in price based on the day of the week and time of year you visit. I have added a link below so that you can choose the exact day you are thinking of visiting and the price for that day will appear on the calendar. Once you open the link, scroll down the page to where it says "1 Park Per Day Tickets."
The ticket prices are listed
here for you, in case you want to add days or add-ons like "park hopping".
I hope this helps and I wish you all a Magical, memorable trip!!
Chris