This is the 11559th most frequent German word.
stiefvaters
"Stiefvaters" is the genitive singular or plural form of "Stiefvater," meaning "stepfather" in English.
Here, 'Stiefvaters' is in the genitive case to indicate possession.
Das Geschenk meines Stiefvaters war eine Überraschung.
My stepfather's gift was a surprise.
This usage shows 'Stiefvater' in the dative case.
Ich habe mit meinem Stiefvater im Garten gearbeitet.
I worked with my stepfather in the garden.
In this example, 'Stiefvater' is in the accusative case as it is the direct object of the verb.