Hi Nelika,
Does this question ring a bell or what to me? My youngest daughter loved
Tinker Bell and she wanted to meet her every time we were at the Magic Kingdom. However, my oldest daughter was happy to meet her once and then did not want to stand in line again.
How we solved this dilemma to see Tinker Bell? We went to see her immediately at park opening. I went with one daughter and my husband went with the other. It worked for us.
This might be an option for your family or scheduling a
meal with a princess might be an option as well. Unless there is a specific princess, you may just wing it and do a walk up to meet one unless her name is Anna or Elsa which you need the FastPass+.
If you do decide to you a FastPass+, your son will need one even stand in the line.
Wishing you a magical vacation!
Beth