Sarah

Grandmother (祖母)undefined is a villain of The Promised Neverland. She is a high ranking human at the Grace Field House, serving as its leader, who considers Isabella as one of her pawns.

When Krone told her about the escape plan of Emma, Norman, Ray, Don and Gilda, Grandma told Krone that she would leave it all in the hands of Isabella because she is important to her and above Krone in every aspect.