Arnold divorced Barbara Devilbiss, then sold all of his Frederick Co. land and settle on land near Little Pipe Creek. By 1820 Arnold was a resident of Scott Co., KY. He purchased land and remained in this county until 1831. He next moved to Ralls, Co., MO, when he died two years later.
Arnold and son, Casper, were among the founders of St. Peter Church at Brush Creek in Missouri; the church was recently listed on the National Register of Historic Places.

Arnold's slave Polly (negro) gave birth to a daughter, Elenora, on 16 Sep 1787. The child was baptised the same day, 1 Apr 1789, as Arnold's son, Casper, was baptised at the German Reform Church.

• Married: 5 APR 1782 in , Frederick, Maryland, USA
• Divorced: 2 DEC 1818 in Frederick Co, MD

1. Casper Hardy b: 6 MAR 1789 in Hagerstown, Washington, Md