Since all these ladies are still in own homes and related to you (even tho it appears some may be through your husband} do they know each other and get along. Our area has some assisted living apartments where meals are served in common dining room, have housekeeping services and nurse on premises. The charges seem rather high around here, but if there were 4 of them with 4 incomes, maybe something like that with 2 bedrooms. I know this suggestion sounds a little bizarre since all probably have their own way of keeping house, etc. but there is no way you can spread yourself thin enough to care for them all with your husband miles away. Only thing I can think of at the moment.