Is it permissible to force one's sister, mother, wife, and daughter to wear the niqab, knowing that the custom of the country does not allow it and damages one's reputation, and is this considered a confiscation of rights?

You do not have the right to force your sister or female relatives to cover their faces, but there is no harm in convincing them of it and explaining its virtue. As for the wife: she must obey her husband if he orders her to cover her face in front of non-mahram men.