The partner lives there too though.
People who cannot get Housing Benefit [HB Reg 7]
Close relatives
You cannot claim HB if you live in the same dwelling as your landlord, and they are a close relative of you or your partner.
A close relative is a:
parent
or step-parent
or father-in-law or mother-in-law
or child
or step-child
or son-in-law or daughter-in-law
or brother or sister
or brother-in-law or sister-in-law
or partner of any of the above.
http://www.dwp.gov.uk...efit/housing-benefit/