I tried digging deeper for you. Turns out there were several Wellington(s) and dozens of "Robert Owen Swift(s)" so I'm unable to determine which line is yours without more information.
If you know more about Wellington that would help. Details such as possible birth date, death, marriage, spouse, where he might have lived or been buried... these would all be useful. Any insight could be the key to unlock the next answer.
You can post what you know here so I and others can use it to help solve your mystery.