What is another word for sib?
Pronunciation: [sˈɪb] (IPA) 
The word sib is primarily used as an informal slang for siblings. For expressing the same meaning, there are several synonyms available in the English language. Some commonly used synonyms for sib include brother, sister, kin, family, relation, and blood relative. Other synonyms that are less commonly used are fellow, associate, neighbor, companion, comrade, and cohort. Additionally, there are several idiomatic expressions that can be used to indicate siblings such as "brothers and sisters," "sibs," and "blood brothers/sisters." The use of synonyms depends on the context in which they are used and the level of formality required for communication.
