Admetus

Alonzo

Asparagus

Bombalurina

Bustopher Jones

Carbuckety

Cassandra

Coricopat

Demeter

Electra

Etcetera

Grizabella

Gus the Theatre Cat

Jellylorum

Jemima

Jennyanydots

Macavity

Mungojerrie

Munkustrap

Old Deuteronomy

Plato

Pouncival

Quaxo/ Mr Mistoffolees

Rumpleteazer

Rum Tum Tugger

Skimbleshanks

Tantomile

Tumblebrutus

Victor

Victoria

Gus is Skimbleshanks' dad. Skimbleshanks is mates with Jellylorum and their child is Jemima.

Old Deuteronomy has three children, each with a different one of his wives. In age order, they are Macavity, Munkustrap and Rum Tum Tugger.

Victoria and Quaxo are siblings. Their parents are unknown, but Bustopher Jones is their uncle, with Jennyanydots being their aunt.

Jennyanydots and Jellylorum are sisters, making Victoria, Quaxo and Jemima cousins.

Mungojerrie and Rumpleteazer are mates.

Tantomile and Coricopat are twins.

Old Deuteronomy and Bustopher Jones are brothers.

Bombalurina and Demeter are sisters. Bombalurina is the eldest.

Etcetera and Electra are sisters. Electra is the oldest. Their parents are unknown.

Asparagus is also Gus' son, and therefore Skimble's younger brother.

Grizabella is Deuteronomy's ex-mate.

The other's (Admetus, Alonzo, Carbuckety, Cassandra, Plato, Pouncival, Tumblebrutus and Victor) are standalone.