Handri,
I looked on rootsireland under the surname Manson for Richard's birth, but did not find anything as I mentioned before. Then when I looked under Richard Mason, a record shows up. It is the same record that you have on your tree; however rootsireland translates it differently than Ancestry does. The original is very difficult to decipher. Anyhow, the roots Ireland shows this:
Richard Mason, DObaptism - 26 Jul 1822, RC parish Cobh (a part of Cloyne), parents - James Mason & Mary Sullivan. As you know, the Ancestry record does not show the name James for his father. Sponsors were William Drew & Mary Dillon.
Then I looked for their marriage record and found this: James Mason & Mary Sullivan married 24 Aug 1821, RC parish Cobh. Witnesses - Thomas Kerby & Mary Murphy.
I looked for additional children besides Richard, but did not find any.
There are many birth records to a Richard Mason in Cork, but no son named Kelly or Ceallaigh. There is a single marriage record for a Richard Mason in 1850 to a Mary Hickey in the RC parish of Shandrum. This couple went on to have a number of children in the 1850s and 1860s in Shandrum and the neighboring RC parish of Charleville.
The only fly in the ointment is the distance, in those days, between the RC parish of Cobh and Shandrum. Do you know if Richard Mason had an occupation that would have taken him that far north in Cork? A couple were usually married in the wife's parish, and typically, the two were from the same parish or general area.
Finally, in your initial query, you wrote "Kelly Manson lived there in the late 1800's"......was he a child? adult? do you have specific years? what records show that?
Regards,
PS. so I guess now you are the "nice" Masons! :)
PSS...my father is/was (retired) a funeral director in LA, and buried Sharon Tate :(