Legal Question in Real Estate Law in California

No. Illness or infirmity is not a defense to properly based unlawful detainer or eviction. The new owner of a foreclosed property [like the old owner] has a right to evict the tenants, as long as the owner follows the terms and procedures of any long term lease or rental agreement, if there is one. Unless you have a lease with protection from termination by extended notice required, you are going to be evicted. Check you lease, and negotiate with the owner. Foreclosure takes months, so prepare for necessary change.