I quit trying to solve the mysteries and came up with this solution. I first color coded each of the people so the toothbrushes were not mixed up. Then I used this code for the combs, brushes, and a container to hold all these washroom needs.
Each child got a container just big enough for the 10 to 15 items that will be used in the washroom. The container was to be taken in to the washroom with them. They did all that is needed and then took the items in the container back to their bedroom.
I had a well lit spot outside of the washroom for the girls to do their make up and not keep the washroom busy too long. Mom and Dad had a dressing table also to do all the last minute prep work before rushing to grab a bite to eat and run out the door.
The family found vacation time easier also because I got them travel pouches with their color taped on it. Trips to a washroom if we went camping were organized and there were less losses of personal items. As my children grew, their collection grew also so they had a few containers with labels on them. This habit is still with them for several areas of their life.
By Carolyn from BC Canada
Related: 
Organizing Your Bathroom
By
01/04/2012
It has taken me 14 years to finally get this same type of plan in order. It really does work well!
Colour coding children is learned very early for those who have twins. I never had twins, so it took me longer to figure it out. :D
A bathroom bag for each child also solves other issues (spread of lice is more controlled since they don't share hair utensils, spread of colds might be lessened since toothbrushes aren't all stored wet and together).
We use colour coding for cups, mittens, etc.
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