P.M.
I was going to suggest the OP pools too, but I think they have to be 3 to move from the parent tot class --and with two you might have a tough time if you have to be with both of them in the water.
(Sometimes you can get them to be a bit flexible with one who is too young ---if they have some skill...I had a 3 year old who took 1st wave b/c she was already swimming--but only certain pool employees can enter those exceptions.)