As far as Jo Johnston knows, all of Duke’s children were born in Lee County, Virginia. His family removed from Lee County in 1857 to Science Hill, Pulaski Co., Kentucky.
6781840 - US Census for Lee County, Virginia (township not stated)
765Duke Covey
2 males under five
1 male five and under ten
2 males 10 and under 15
1 male 30 and under 40
1 male 70 and under 80
1 female under 5
1 female 5 and under 10
2 females 30 and under 40
1850 - Lee County, Virginia
414Duke 50 farmer VA
Mourning 40 VA
Noble 23 farmer VA
Ashley 21 farmer VA
Isaac 18 farming VA
Jane 16 VA
George 13 VA
William 13 VA
Nancy 11 VA
Elizabeth 9 VA
Rebecca 7 VA
Lavina 3 VA
Susan 1 VA
Ruth Scott 60 VA
1860 - Pulaski County, Kentucky
766Duke 59 farmer VA
Mourning 50 VA
Isaac 25 farmer VA
Nancy 20 VA
Elizabeth 18 VA
Rebecca 16 VA
Lavina 14 VA
Susan 12 VA
Mourning 10 VA
1870 - US Federal Census Pulaski County, Kentucky
764Duke Covey 69 M W Farmer 400 300 VA
Morning 59 F W Keeping House VA
Isaac 39 MW Farm Laborer VA
Melissa L 33 F W domestic work VA
Susan B. 21 F W domestic work VA
Mourning M. 18 F W domestic work VA
1880 - Buncombe, Pulaski County, Tennessee
767Duke 79 farmer VA NC NC
Morning 69 Keeping house VA VA VA
Isaac son works on farm VA VA VA
Susan B dau VA VA VA
Morning dau VA VA VA