Great news: you only need to sit through one episode of Bluey to identify the family. Bluey and Bingo are brother and sister. Their parents are Bandit (the dad) and Chilly (the mom). There are also around 20 minor characters that appear occasionally. See the official Bluey website for a complete list of characters: https://www.bluey.tv/characters/. It has a helpful bio for the four main characters and shorter blurbs for the rest.