Tenants with one spare bedroom have had a payment reduction of 14% and those deemed to have two or more spare a reduction of 25%.
Lawyers for the 10 cases say that, unless the families move from their homes into smaller properties, they face building up rent arrears and being forced out any way.
More top news
Singer paid emotional tribute to victims of the Manchester Arena attack, saying 'it's awful... and whatever you can do to help, you should'.
The broadcaster, who also writes for MailOnline, 'agreed' with the radio station that she would no longer work there.
The US grunge star was found hanged and leaves behind his wife and three children.