Thanks everyone for your help. It's a tricky one.
Yes they were married in 1863. You go to press one button on the computer but your finger presses another one instead!

I don't believe that the Morgans are related to Martha and she isn't living with them in the 1911 census. I haven't thought about obtaining Martha's will. I just presumed that she left her money to them. As an aside, I haven't been able to find a death registration for Martha either!
I should point out that I looked also to see if they were perhaps living in Scotland but I couldn't find anything there either.