This is the 4247th most frequent German word.
deines
"Deines" means "yours" (possessive pronoun, informal singular).
The word 'deines' is used here as a possessive pronoun indicating ownership, referring to 'Bruder'.
Das ist das Buch deines Bruders.
That is your brother's book.
The word 'deines' is used to evoke a personal connection, complementing 'speziellen Autos' in the context of possession.
Ich habe das Foto von deines speziellen Autos gesehen.
I have seen the photo of your special car.
The word 'deines' is employed as a genitive possessive pronoun describing ownership related to 'Vater'.