When it comes to referring to a sibling or a younger person, "our kid" might not be the only option available. There are many different synonyms that can be used to refer to a brother, sister, or a younger person in your family. Some common alternatives include "little one", "youngster", "sibling", "bro", "sis", "babe", or "young 'un". Depending on the context and cultural background, some people might also use "mate" or "pal" to refer to a younger person in their family. These different terms can add a personal touch to a conversation and make it easier to differentiate between different siblings or younger family members.