What is the name of Mike Wheeler's younger sister in Stranger Things?

Mike Wheeler’s younger sister in Stranger Things is Holly Wheeler. Holly is the youngest child of Karen and Ted Wheeler and the younger sister of both Mike and Nancy.

Holly is initially a minor character, usually seen at the Wheeler family home or alongside her parents. Because she is much younger than Mike and Nancy, she is not part of the boys’ Dungeons & Dragons group or the older teenagers’ investigations. Even so, she occasionally notices unusual events that the adults and older children fail to understand.

Her family connection helps place the supernatural story inside an ordinary suburban household. The Wheelers’ home becomes a meeting place for Mike and his friends, and Holly is often nearby as the family struggles with disappearances, strange visitors, and escalating danger in Hawkins.

Holly is sometimes confused with Nancy because both are Wheeler siblings, but Nancy is Mike’s older sister. Holly is the youngest. The role was played by twins Anniston and Tinsley Price in the earlier seasons and was recast with Nell Fisher for season five, when Holly became more prominent in the story.