The ruling on a woman greeting her maternal cousins if her maternal uncle married her mother after her father’s death

Question:
I ask Allah to guide you. A person from al-Qassim sent three questions. We will address the first one. He says: My mother’s father passed away when she was three years old. Then her maternal uncle, her father’s brother, took charge of raising her. When she reached maturity, he married her, and she passed away while with him. After that, her husband had children with another woman. Now, these children greet my mother without a hijab. Is it permissible for her to greet her maternal cousins? Please note that she is over fifty years old.

Answer:
It is not permissible for her to greet her maternal cousins in the sense of shaking their hands, because they are non-mahram to her. She should only greet them with words, without shaking hands, and also with a hijab. She must adhere to the hijab, which means covering her face, her hands, and her body from them. Yes.