In 1830, their mother was still Administrator for the affairs of Harriet and Mary which likely means they were still less than 18 years old.
Logan Co DB X; p.346 16 Mar 1841 Richard H. Cook and Harriet his wife to William M. Haden $430. Land on Black Lick fork of Gaspers being the parcel assigned to Harriet Haden now Harriet Cook in the division of the lands of James Haden dec'd among his heirs, Harriet being one of the heirs of said dec'd. decriber in a deed dated 2 Sep 1828. Signed: Rich. H. Cook, Harriet Cook
Found in 1850 Logan Co KY Census with Harriet and family.
Harriet S. R. HADEN and Richard H. COOK had the following children: