Check out a new book called The End of Alzheimer's. The author is Dr Bredesen and much of his groundbreaking work with Alzheimer's patients would probably also apply to stroke and other brain injury patients.
I'm dealing with my 85 year old mom who fell and had a concussion - she didn't have dementia before the fall but is showing signs since - she's not aware of how often she repeats a question I've already answered. I'm hoping she continues to improve, but it's definitely a problem.
You sound 100% but is it possible that your kids are picking up subtle signs of residual damage?