This is the 249th most frequent Bulgarian word.
техните
"Their" (possessive pronoun).
In this sentence, 'техните' functions as a possessive pronoun describing the parents that belong to 'them'.
Видях техните родители на събитието.
I saw their parents at the event.
Here, 'техните' is used to indicate possession of opinions by a group referred to as 'they'.
Техните мнения са важни за взимането на решение.
Their opinions are important for making a decision.
The word 'техните' is used as a possessive pronoun referring to something belonging to them (a group of people).