This is the 7016th most frequent Russian word.
бабушки
"Бабушки" means "grandmothers" in English.
Here, 'бабушки' is in genitive case, used to specify the 'photographs of grandmother'.
Я видел много фотографий бабушки в молодости.
I saw many pictures of grandmother in her youth.
Here, 'бабушке' is in dative case, showing the direction of moving towards the grandmother.
Я иду к бабушке на ужин.
I am going to grandmother's for dinner.
Here, 'бабушкины' is in possessive form, indicating the ownership by the grandmother.