Here is an article from Canada about caring for a spouse with early onset dementia that might be of interest. As the article points out, the first signs of this type of dementia may not be memory loss but, instead, difficulties with problem-solving or agitation and anger, or a marked change in executive functions.
A friendly, locally-run social respite program for older adults with memory loss or physical frailties and their caregivers in Pierce County, Wisconsin
a social respite program 