ideas anyone?

I am tired of showering with 17 kids! ok its only 2 or 3 but it feels like 17! We do not have a bathtub. We have only two showers. Sophie with her legs at 90 degrees and Ben who cant/wont walk barefoot and without splints to the shower and in the shower (and Maia who just doesnt like to shower alone!) As they get heavier its hard to lift them off the floor of the shower while they are soaking wet and slippery. and cleaning them while they sit on the floor of the shower isnt so fun either. So I need ideas here! Ben is 6 but pretty small and sophie is 4 and pretty small. Are there help things out there I can use in the shower? it isnt a huge shower because it has a seat built in which oddly enough is pretty useless as the kids just slide right off of it. IDEALLY I would move to a new house but that just isnt happening so I need to find a way to get them cleaned up quick and easy and be able to shower ALONE. One shower has double sliding doors, one has only a swing out glass door. we mostly use the one with the double sliding doors. (ps who the heck builds a house without a bathtub???!!) HHEEEELLLPPP!