Comment on Liberal Democrat Manifesto 2010 Your Money Fair Taxes And Fair Benefits by K Taylor.

Why has my mother in law had spend her savings and sell her house paid for by her husband a postman (hardly a highly paid job) and herself doing a few part time domestic jobs (cleaner etc) to pay for her nursing home care costs?. Their home was their pride and joy. It was their belief that it would be passed on to their children.
Had they lived in rented accomodation and spent every penny of their income overseas on holidays her care would be paid for by the taxpayer as is other peoples in care homes.
In reality she is being taxed at a very high rate on money (savings in particular) that has already been taxed for being a responsible citizen.
Where does the fair taxes and benefits fit here? and why has this situation not changed. Care costs based on lifetime earnings would be so much fairer.