What dates are we talking?
Can you not research vis the usual routes - ie censuses/BMD certs etc?
Have you got Catherine's marriage cert to Mr Powell?
Have you got her on a census with her father John(dependong on dates of course)
HAve you got her birth cert, showing both father and mother incl maiden name, and place she was born?
From that have you found her parents marriage? And thus the name of John's father from the marriage cert?