Short answer
The main Parent visa subclasses are 103, 804, 143, 173, 864 and 884.
Subclass 103 Parent and subclass 804 Aged Parent are parent visa subclasses.
Subclass 143 Contributory Parent, subclass 173 Contributory Parent (Temporary), subclass 864 Contributory Aged Parent and subclass 884 Contributory Aged Parent (Temporary) are contributory parent visa subclasses.
Subclass 103, 143 and 173 are generally offshore pathways. Subclass 804, 864 and 884 are onshore aged parent pathways.