This is the 16406th most frequent Russian word.
родительница
Mother; female parent.
"Родительница" is used here in its singular form to indicate the mother specifically, as "родительница" refers to a female parent.
Моя родительница Купила мне книгу.
My parent (mother) bought me a book.
This illustrates "родительница" as a subject in the past tense sentence, highlighting the storytelling by the female parent.
Вчера родительница рассказывала старинные истории.
Yesterday, the parent (mother) told old stories.
The word "родительница" in this sentence reflects the personal relationship context, emphasizing the act of meeting the female parent.