Yes I see what you mean, I found the family in 1891... and I also found what could be Roberts birth in Birmingham 1853 however it's down as Robert Edwin Sherwin (not Edward) maybe another mistake!
[SIZE=+1]Births [/SIZE]Birmingham [SIZE=+1]Mar 1853 [/SIZE]Volume: [SIZE=+1]6d [/SIZE]Page: [SIZE=+1]151[/SIZE]