Why is it die Familientradition?

Familientradition is a compound noun, and German compounds take the article of their last word: die Tradition. So it’s die Familientradition.

Sense 1
die

Meaning

[1] Complete of the principles and behaviors that are preserved in a family for a long time

[1] Gesamtheit der Prinzipien und Verhaltensweisen, die in einer Familie über längere Zeit gewahrt werden

Examples

[1] "The oldest grandson should therefore grow into the family tradition, preferably into the merchant tradition"

[1] „Der älteste Enkel soll also in die Familientradition, am besten in die Kaufmannstradition hineinwachsen.“

Declension

1 Singular Plural
Nominativ die Familientradition die Familientraditionen
Genitiv der Familientradition der Familientraditionen
Dativ der Familientradition den Familientraditionen
Akkusativ die Familientradition die Familientraditionen

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary