My husband 's Great Great Grandfather (John William/William Sylvester Pilkerton) was James Richard Pilkerton's brother. Their father was John Sylvester Pilkerton b. 1824 d. 1880, mother was Ann Fenwick Copsey Pilkerton b 1817 died abt 1880. They were married abt 1851. Although we aren't sure if they ever really married at all as she was listed As Miss Ann (Pilkerton) Copsey in her burial records. My husband and I are currently trying to find out who John Sylvester's father was. We have several possibilities, but need to go back down to St Mary's County historical society to do more research. I hope this information was of some help to you.