Welcome, Shari!
The Disneyland Resort is truly the Happiest Place on Earth, so to be able to share this experience with your two year-old and his or her grandparents is going to be so magical. When my daughter was very young, and our son was just a few months old, we took them with their grandmother to the Disneyland Resort and have the most special memories of that visit. My mother-in-law was a child again herself, getting to re-experience the attractions at Disneyland with her new grandchildren, seeing the magic through their eyes. I'm excited for your family to experience this too!
You'll be happy to know that two adults and one small child will fit together on many
Fantasyland attractions.
Peter Pan's Flight,
Snow White's Scary Adventures, Alice in Wonderland,
Mad Tea Party,
Pinocchio's Daring Journey,
"it's a small world" and quite a few others feature either a bench seat across or two rows that Amy accommodate the three of you together, but on a few of them, to spread out a bit, one adult and child and another adult behind them will be a better, more comfortable way to ride. For example,
Alice in Wonderland does have two rows, but with five of you, I think it would be better on that one to ride in two cars, so your little one can sit in the front. Two adults and one child in the front row would be tight with two adults behind them. I'd probably put two adults in one car and two adults and your young prince or princess in the other car so your little one can ride in the first row with one of you to see it all without anything or anyone blocking the view. I bet your little one would love to ride alone with Grandma and Grandpa on a few rides too, so that would be a good one for it! With so many attractions, you can mix it up as to who rides with who each time!
Have so much fun planning this magical vacation, Shari!
Marcy