Englishfor English speakers
younger
—
adjective
(= jr.)
used of the younger of two persons of the same name especially used to distinguish a son from his father
John Junior
John Smith, Jr.
sister
Noun
—
Your sister is the daughter of your mother and father.
My parents have three children: me, my brother, and my sister.
—
A sister is a nurse in a hospital.
The Sister said that I must rest more.