sibling

/ˈsɪblɪŋ/noun

A brother or sister; someone who has a parent in common with you.

Example sentence

“She grew up with three older siblings.”

The formal, official term. On forms and in research writing you see 'siblings'; in conversation people say 'my brother and sister'.

Related words

spouseThe person someone is married to; a husband or wife.parentSomeone who brings up a child, whether the child is their own by birth, adoption, or fostering.husbandA married man, considered in relation to the person he is married to.nieceThe daughter of your brother or sister, or of your spouse's brother or sister.wifeA woman who is married, seen in relation to her partner.nephewThe son of your brother or sister, or of your spouse's brother or sister.