The notion of a quarrel between Nikola and his "dad" is present in a number of legends. The connection between the father–son pairs of "Stari Badnjak"–"Mladi Božić" and Nikola's Dad–Nikola is corroborated by the fact that, in many East Slavic regions, practices characteristic for Christmas have been transferred to the Feast of Saint Nicholas. There is, however, an inversion in the comparison between these two pairs. In the former pair, the first stems from the mythical dragon, and the second from the dragon fighter, while in the latter pair it is vice versa. This inversion explains, by Uspensky, the fact that in some areas Nikola's Dad is celebrated on the day after his son's feast, rather than on the eve of it. In that way, the "dragon" (Nikola) comes before the "dragon fighter" (Nikola's Dad), as is the case with "Stari Badnjak" and "Mladi Božić".