All my sister-in-law, Joy! Hers is real-life, hard-won knowledge as the sole caretaker of a mother with severe dementia. Glad to hear that some of the suggestions are helpful, and may be adapted by others.
Kate, I have added Norma's suggestions for caregivers to my post. I was most struck by the need to CARE for the caregivers. These needs may be related to mental health (therapists, social workers could donate time), medical (caregivers ignore their own health concerns), financial (teach caregivers how to access financial aid/subsidies, or professional (legal resources to support caregivers). I didn't realize that - in serving the needs of seniors with dementia - the needs of caregivers are so often overlooked. Even as a family member, I did not realize the array of needs Norma faced in caring for her mother (my former mother-in-law).
As a family member, I would suggest community-based training, easily accessible, and (hopefully) free of cost. Perhaps hosted at a local school, medical facility, library, church, or other public location? Alternatively, online social media like NextDoor would be an excellent way to organize training for caregivers. Neighbors could identify caregiving needs (dementia, stroke, etc), possible local training spaces, shared experiences, etc.