I decided to go with musical terms:
Minuet is the girl
Requiem is the boy with the white toes
Cadence is my big laid back boy
Treble is the smallest boy and the whiniest
Nocturne is the darkest of the three boys that look alike
They are just darned cute. Nocturne appears to be possessive of the canned food - he was growling last night after I put down the plate. However, without missing a bite, Minuet reached out and smacked him in the head!! That's my girl....