Be aware of the possibilities of lifestyle conflicts, the physical demands of 24-hour oversight, and changes in marital and familial relationships. Be sure to work out the finances and living arrangements before the move, especially if it's long distance. On the plus side, multi-generation households offer a special quality of life, especially if there are grandchildren, and it is much easier to monitor diet and medications with your elder in sight. Sometimes children move into their parent's home, perhaps after modifications. Be sure you consider all the financial and lifestyle ramifications, as well as issues of control and interdependence.
Entrance is usually separate from the main house.
This stands for Elder Cottage Housing Opportunity, and means a small, self-contained portable unit placed on the same property but detached from the main house. Check with your city's zoning department to see if these units are allowed. Consider tax treatment, utility hookups and privacy. ECHO Housing also administers the reverse annuity program, the Home Equity Conversion Counseling Program. Sharing a home is also a common solution.