4 days late, but i hope my answer is still helpful.

I am not 100% sure what exactly you're asking, but i think you want to know if the king of the HRE was always succeeded by his dynastic heir/son, so i will answer that. If i misunderstood your question, please let me know and tell me what you want to know instead.

The king of the "Roman Empire" held the title rex Romanorum ("King of the Romans") since the late 11th century. The term "Holy Roman Empire" (sacrum Romanum imperium) itself developed in the late 12th century. The kingship of the HRE however wasn't based on succession like it was elsewhere, e.g. England. The rex Romanorum was elected by the 7 highest noblemen of the HRE. Those were: the archbishop of Mayence (Mainz), the archbishop of cologne (Köln), the archbishop of Treves (Trier), the count palatine by Rhine, the duke of Saxony, the king of Bohemia and the margrave of Brandenburg.

While there was succession of kingship from Father to son, e.g. Wenzel following his father Carl IV. in 1378, there also was election of kings who weren't related in any way to their predecessor, like Adolf of Nassau, who succeeded Rudolf of Habsburg in 1292.

TL;DR no