Does a woman have to cover herself in front of her husband’s sister’s sons?

The questioner:
We are taking a call from our brother Abu Fares from Jazan. Go ahead, Abu Fares. Good evening, O Abu al-Shaykh. Hello, peace be upon you.

The Shaykh:
May Allah greet you.

The questioner:
My wife is my cousin’s daughter, and I live next to her maternal uncle, who is her mother’s brother. Is that right? Okay. She has small children. He says to her, “Auntie, your children, who are my sister’s children, have grown up now.” He says to her, “Auntie, the children are living next to my sister, and her children say, ‘Brother, no, now that her children have grown up, do they look at her?’”

The Shaykh:
Which sister of their mother?

The questioner:
Yes, Yusuf. I am living with my sister.

The Shaykh:
Is she not their mother’s sister?

The questioner:
No, she is not their mother’s sister.

The Shaykh:
I am asking, is she their mother’s sister or not?

The questioner:
No, she is a wife.

The Shaykh:
Their mother’s sister is not their aunt.

The presenter:
All right.

The questioner:
Okay, I am saying she is not their aunt. May Allah guide you.

The presenter:
Okay, the Shaykh has answered this. Thank you, Professor.

The Shaykh:
And she does not uncover herself to them.

The presenter:
Yes, they are not mahram to her.