Yay Clare! It was always such an exciting day in our family when our littles grew tall enough to "graduate" to attractions with a height requirement.
I am happy to let you know that according to the
park rules children age 7 and above may board attractions without being accompanied by an adult. Your family shouldn't have any trouble sitting in the configuration you describe.
In addition to
Seven Dwarfs Mine Train, your youngest now also meets the 38" height requirement for
Kali River Rapids,
Slinky Dog Dash, and
Millennium Falcon: Smugglers Run!
Clare, I would like you to know that even though your child meets the height requirement for a particular attraction, you can still use
Rider Switch. Sometimes although my children were tall enough to board an attraction, they were frightened and did not care to ride with the rest of the family.
I hope that helps! Have a wonderful visit, and please let us know if we can answer any additional questions.
Anne Marie