Two of Franz Rieger's sons followed their father in his craft: Otto Rieger (3 March 1847 – 12 December 1903) and Gustav Rieger (1 August 1848 – 1905), served apprenticeships with their father. They then spent time as journeymen in Vienna, where they trained from 1864 with Franz Ullmann, another builder in the classical tradition. They also spent time in Bamberg and Würzburg, where they visited the workshop of noted Franconian innovator Balthasar Schlimbach. Upon their return home in 1873, their father passed his workshop to them, remaining in a consultative capacity until 1880; the name of the firm became "Franz Rieger & Söhne" and the opus count was restarted at zero. Otto married in 1873 and Gustav followed suit in 1874.