According to the 1860 and 1870 listings for the family of Thomas Churchwell Hooper Joslin, his daughter Mildred was about a year older than his son Jesse.

According to his death certificate, Jesse died 27 Sep 1917 and was born 8 Jan 1853. His mother is identified as Mary Hooper. Thus, it seems likely that Jesse's elder sister Mildred also was a child of Mary (Hooper) Joslin.
Adding to the support for the above hypothesis is the fact that the box "Married within the year" is ticked for T.C.H. Hooper and for his wife Louisa on the 1860 census in Dickson County, TN.

It would seem that Mary (Hooper) Joslin disappeared from the household between 1853 and 1859.

The 1900 census for Davidson Co., TN shows Thomas C.H.Joslin, born Dec 1821, in the home of his son Frank, who had been born in Feb 1861. This matches the info gleaned from the family census for 1880 Lake Co., TN, and indicates TCH Joslin had returned to the Nashville area. I've not found this Thomas C. H. Joslin on a later census. So, it is highly possible that the entry at the Tennessee State Library and Archives index titled "Death Notices in Nashville Newspapers 1855-1907" which reads "Thomas Joslin, 12 Feb 1901 NA" [Nashville American] applies to your ancestor. I haven't checked the actual death notice. See http://www.tn.gov/tsla/history/vital/nd11.htm for the entry.

Thomas Churchwell Hooper Joslin was obviously named for his mother's father [Churchwell Hooper, d. 1808] and her uncle Thomas Hooper [d. 1826]. It's these Hoopers who are the interest for me, since I'm a Hooper researcher. I don't know much more than I've given for these Joslins.