Is the testimony of two people valid regarding their mother's co-wife being falsely accused of adultery (*qadhf*) by her husband?

Primary text

The testimony of two witnesses regarding the husband's false accusation (*qadhf*) directed at their mother's co-wife is accepted. This acceptance is valid regardless of whether the husband is their father or another man, because this testimony does not increase any right belonging to their mother. The potential effect on inheritance does not invalidate the testimony, similar to the accepted testimony of an heir regarding the deceased whose estate they would inherit.