This is the 526th most frequent Czech word.
jejího
"Jejího" means "her" or "hers" in the genitive or accusative singular form in Czech.
Here, 'jejím' is being used as the instrumental singular form of the possessive pronoun, paired with the masculine animate noun 'bratr'.
Setkali jsme se s jejím bratrem.
We met with her brother.
In this sentence, the word 'jejího' denotes possession and is used with the masculine animate noun 'názor' in the context requiring genitive singular for 'opinion'.
Myslíš, že jejího názoru na věc změní?
Do you think she will change her opinion on the matter?
The word 'jejího' is in the genitive singular form and is used as a possessive pronoun for 'her dog (male)'. The masculine animate noun 'pes' requires the genitive singular form in this context.