Is it permissible for the heirs to make their sister, who lived with their deceased mother, swear an oath that she did not seize the mother's money before or after her death?

If the sister is upright and not accused, then they have no right to make her swear an oath or to think ill of her. Sheikh Illaysh stated that one who accuses a righteous person is not allowed to make the accused swear an oath, and the accuser should be disciplined. However, if there is something that gives rise to suspicion and justifies accusing the sister, then there is no blame upon them for making her swear an oath, for the accused is made to swear. As for those who are of average standing among people, they are not made to swear an oath, nor is their accuser disciplined. And the accuser of a good person must be disciplined.