Rosser Jenkins
He was traveling to the Valley with his mother and siblings. His brother, Joseph, is mentioned in the reminiscences of Thomas A. Davis, who traveled with the 1863 Ricks Company. As Joseph was only seven years old at the time, he was likely traveling with the rest of his family so this mention justifies placing the family in this company as well.
His name is mistakenly record as "Rosa" on the British Mission Records in Mormon Migration.