Al-Qawa'id Are the Elderly Women, Not Those Who Remain in Their Houses
Question :
My paternal uncle's wife is a Qa'idah (i.e., she does not work and stays in the house), so is it permissible for her to unveil herself in front of me?
Answer:
The answer to this question may be taken from the Words of Allah, Most High:
"And as for women past childbearing who do not expect wedlock, it is no sin on them if they discard their (outer) clothing in such a way as not to show their adornment. But to refrain (i.e. not to discard their outer clothing) is better for them,"
What is intended by Al-Qawa'id is elderly women.
"who do not expect wedlock."
that is, none of them hopes to be married because of her advanced age. There is no sin upon her if she removes her cloak, without revealing anything of her beauty. As for one who has retired from work while she is still a young woman, she is not included in this Verse. The wisdom in this is clear, because the Qa'idah (the elderly woman) is one who does not expect to marry, who does not attract glances, and does not incite desire for her, so no temptation will occur due to looking at her.
Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 5 Pages 239-240