Hi Lauri!
Thanks for your question and for visiting us here at the Disney Parks Moms Panel!!
First off, let me say that the fact you even ask this question speaks to how courteous you are, in my humble opinion! :)
The short answer is yes, of course, you can rejoin your family in the attraction queue! We have all been there without exception, whether here at
Walt Disney World or anywhere else for that matter, and other guests usually are very understanding of this occurrence.
As long as your family has not already boarded the attraction, you should have no problem rejoining them in the queue. If needed, Cast Members will be happy to assist you, but it really may just take a few "excuse me's" to get back with your family. I have NEVER seen this be an issue with other guests.
I hope this helps and I wish you all a Magical trip!!
Chris