Is it permissible to give the mother from Zakat money to repay a debt she took from her brother without his knowledge, and she is unable to repay it?

It is permissible to give an indebted mother from her son's Zakat money to pay off her debt if her inability to pay is proven, as the gharim (indebted person) is one who cannot find a way to repay his debt. The fact that she owns jewelry does not prevent this, provided she needs it for adornment.