The five brothers were, in order of birth: Henry (1826-1895), Clement (1831-1901), John Mohler (1833-1917), Peter Everst (1836-1897), Jacob Franklin (1844-1887). Their father was named John (1799-1877), their mother Rebecca (née Mohler). They had five sisters. http://www.fritziinc.com/tree/pafg200.htm#5614

There are other photos of John M. and Clement here. They and the other brothers in the photograph have also been identified from named photographs taken in 1902 for the company's golden anniversary, and republished in Longstreet (1952)^{[1]:(after p.42)}. On the same page is a list of the brothers' dates of birth and death. The 1919 history published by Erskine^[2] contains photos of John Studebaker (Snr); his wife Rebecca Mohler (1802-1887); and the five sons, plus directors Frederick Samuel Fish and Henry Goldman.