Question

Which aristocrat tried to save Marie when she falls in the river

Answer 1

I believe you are referring to the Disney cartoon "The Aristocats."
At one moment during the film, one of the cats called Marie falls off the truck and into a river. However, she is saved by one of the Aristocats called Thomas O'Malley, a feral cat who falls in love with the Duchess and acts as a fatherly figure to her kittens.