In the book, I noted that "the 1830 listing shows four sons between 5 and 20 years of age, and three daughters; the 1840 census shows 3 younger males 10–20 and 5 females under 20 living with Justus and Miriam. Lack of listing for Justus in 1850 prevents identification of most of their names." So there are probably more children that have not been identified, especially daughters whose marriages haven't yet been found. If a candidate [such as a wife born ca. 1815 to 1830 whose maiden name was Rockwell] turns up in the neighborhood of Williams County, Ohio, including over the nearby borders in Hillsdale Co., Michigan or Steuben Co., Indiana, it may be another child of Justus and Miriam.

Descendant John Mellick of Merritt Island, Florida, has sent to me details of the family of JKR's son Edward and Lavinia (Curran) Rockwell. Their children were:

1. Martha Ann Rockwell, b 10 Nov 1837, Hardin Co OH, d 23 May 1923, Mapleton, KS, bur Mapleton Cem, Mapleton, Bourbon Co, KS; m. William James Coyan, 11 Apr 1868, in Wapello Co, IA (this para from Coyan, see 6 ch on WorldConnect)
2. Elizabeth Rockwell, b 28 Aug 1839 d 27 Oct 1851.
3. Mary Jane Rockwell, b 18 May 1841, d 6 Feb 1914.
4. John Rockwell, b 18 Feb 1843, d 20 Feb 1843.
5. George Washington Rockwell b 20 Feb 1844, d 6 Jan 1931; m 19 Feb 1871, Lucinda Dudgeon.
6. Emaline Rockwell, b 1 May 1847, d Nov 1948 (lived to be 101)
7. James K. Rockwell, b 18 Feb 1850, (in OH per 1870, census per Coyan), d 23 Nov 1907. Was single, age 30, living w/Lavinia in 1880 census of Competine, Wapello Co, IA.
8. Amanda Malvinia Rockwell, b 16 Sep 1852 OH, d 4 Oct 1923, Memphis, Missouri (per Coyan), m 14 Oct 1888 Fletcher W. Hyde. Ch: Hugh Earl Hyde (b. 1893) & Clinton Wyatt Hyde.
9. Matthew Rockwell, b 4 Dec 1854 IA, Chr 18 Apr 1855.
10. Benjamin Franklin Rockwell, 1856-1888. was age 24 & single in 1880 census IA.

I mistakenly listed Edward's son George Washington Rockwell's vital years as "1844-1871." In actuality, 1871 was the year of his marriage, and he lived until 1931. John Mellick sent me the transcript of George's obituary, probably from a newspaper in Winfield, Kansas, that reads as follows [with minor corrections to the original's spelling]:

George Rockwell was born near Kenton, Hardin County, Ohio, Feb. 20, 1845, where he grew to manhood. His father died at an early age and he helped his mother raise the family of seven children. His mother died in 1910 at the age of 98 years. He is survived by one sister, Mrs. Emaline Burtnett of Salem, Oregon. He was united in marriage to Lucinda Dudgeon, Feb. 19, 1871, at Wapakoneta, O. From here they moved to Wapello County, Iowa. To this union seven children were born, six girls and one boy, and are as follows: Eva Duff (deceased), Mollie Tetrick of Cedar Vane, Ida Booher of Hooser, Cora Rockwell (deceased), Ola Beals of Dexter, Odus Rockwell of Cambridge, and Millie Bargur of Cambridge. In the spring of 1889 with their four oldest daughters they moved to Kansas. Wichita being the nearest railway center, they shipped their goods to that point, unloading the horses and wagons and hauling their goods to a temporary residence on Timber Creek. In the fall of the same year they moved to their claim and developed the Rockwell homestead together with the large family experiencing all the pioneer hardships necessary to the building of a new state, such as herding their cattle on the open range, fighting the prairie fires that gave their warning roar that could be heard for a distance of 10 miles. They hauled their winter fuel from the coal banks in Chautauqua county, and taking their grain 25 miles to the nearest mill in Winfield, returning the following day with their winter supply of flour. Mr. Rockwell has been for many years a member of the Methodist church at Plum Creek, where he built many lifelong friendships and earned the reputation for honesty, and that of a good friend and neighbor. He was deliberate and thorough in all his undertakings and sympathetic in his business dealings, dependable as a man and friend in time of need. In 1917 he retired from the active duties of the farm and moved with his wife to the present home in Dexter, where he passed away Jan. 6, 1931, as a result of a paralytic stroke of short duration, although he had been in failing health for several years. He is survived by his faithful wife, who has cheered and helped him along life's journey.
Funeral services were held Thursday at 2:30 o'clock at the Methodist church, conducted by Rev. J. W. Dibben of Winfield, and an old friend of Mr. Rockwell. ... Casket bearers were grandsons and were Clarence and Owen Booher, Frank Beals, Orvill and Maurice Tetrick and Chester Duff. The large crowd present and the beautiful floral offerings bespeak for the high esteem of which this pioneer for 51 years a resident.