Who were George Washington Carver's brothers and sisters?

He had at least one sister and one brother.

When George was only a few weeks old, he, his mother, a sister and a brother were all kidnapped from Moses Carver, slave-owner of George's parents. Moses Carver recovered George's brother James, who was just a toddler, and hired someone to find George's mother, sister and George. George's mother and sister were never found but George was recovered, and returned to Moses Carver.

Moses and his wife Susan, raised George and his brother James as their own children.