You could do that, and then the tenanted property could be sold.
You should refer to the Department of Health's Charging for Residential Accommodation Guide (CRAG) - although note, this is about to be updated.
Para 7.007 states Where the LA considers it reasonable to do so, they can disregard the value of premises not covered in paragraphs 7.002-006 in which a third party continues to live. LAs will have to balance the use of this discretion with the need to ensure that residents with assets are not maintained at public expense. It may be reasonable, for example, to disregard a dwelling's value where it is the sole residence of someone who has given up their own home in order to care for the resident, or someone who is an elderly companion of the resident particularly if they have given up their own home. Schedule 4 para.18