I always get my 3 girls to share a shower suite when we travel as a family, otherwise the eldest would stay in there until the next flights boarding
How does making all three of them share a suite make sure that they will
all be showered by boarding time?
At best, it may mean that the eldest will take up 90% of the shower time, the middle one 9% and the youngest 1%. Hardly seems fair

then you also have the problem of rationing the shampoo, the conditioner, the hair dryer, the body wash, the moisturiser....
I wouldn't have thought most shower suites were large enough to share with two people, let alone Princess Fiona's three daughters.
The largest showers I've encounters are the QF Int J at SYD & SIN. The SIN ones could fit two pax in the shower quite easily - but I never have a female travelling companion with me who could help try this out!
If you want a
huge shower suite, try the BKK JL Sakura Lounge. They only have one shower, but the shower itself is massive. You can easily swing a cat inside (although not that you'd want to); probably easily fits 4-6 people, although they wouldn't all be in striking (or useful) distance to the water from the shower head.
Now in saying that, let's not get carried away with any ideas (both planned for real and in dream land -
you know what I'm talking about! 
)
Besides,
thewinchester, the way you put it, if you
did get a chance to try out co-showering then getting clean is probably the last thing.... oh, never mind... :mrgreen: