Sibling
/sˈɪblɪŋ/
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Definition
(noun) A person who shares a parent; one's brother or sister who one shares a parent with.
Sentence Examples
There was a lot of sibling rivalry between Tom and his brother.
I have only one sibling.
CEFR Practice Quiz
He took his younger ____ to the park to play on the swings and enjoy the warm afternoon sun.