A MISSING sister and brother have led to a desperate search by cops trying to find the pair after 11 days.

Sienna Mann, 9, and her brother Brody, 7, were last seen in Southport with their mother, 41, and her partner on Sunday, September 7.

Four individuals, two adults and two children, smile at the camera.Brody and Sienna Mann were last seen with their mother Joanne Bearman, 41, and her partner 38-year-old Dean Speakman Brody Mann and Sienna Mann smiling for the camera.They were at Albert and Victoria Hotel in Southport on September 7

The children are originally from Essex, and were last seen with two suitcases and two carrier bags on them.

Merseyside Police have launched a desperate appeal to anyone who may have seen them to ensure their safety.