Firstly, the Penders were Bob Pender, his wife Margaret and their daughter Doris, and Will Pender. There may be other family members that I don't yet know names for. There were also other troupe members who were not related.

Our first problem is how do we refer to the man? Bob Pender or Robert Lomas?
I would suggest that if we are referring to him whilst performing then we call him Pender, but when referring to him in a genealogical context we call him Lomas.