Here is a resource that might be fun to some people. At the site ancestry.com.au you can now look up all the people send to Australia as convicts.
There were 7 people named Rolph sent. I think I'll talk to Dad about his research, get a copy and then sign up for the free trial membership required to dig a bit deeper. I was never that interested in ancestry, but proving convict heritage, thats a different thing!
On a slightly related note, somebody called David Rolph from Sydney just contact me on a whim via my membership on Facebook. We agreed to share the name fairly, but I am not sure I trust him.