Why is it that the vast majority of help books and articles are geared toward those who are caring for parents?

As I go thru the Alzheimer's Reading Room I find subjects that are of real interest to me, but when I go further it turns out to be a book for sale, which costs about $15 just for a paperback. There is no way I can afford to buy these. I also looked at one for helping family members understand the scope of the dementia that their grandparent or father is experiencing. Thus book was $24 and I need at least three. No can do. I have checked my library and there is a very limited number of titles dealing with dementia. And again, why is it that most books and articles are geared towards parents that have dementia. I guess that my situation is not all that common. I am 10 years younger than my husband. That creates such a loss. I feel like a widow whose spouse haunts every moment and the affection in any form is crowded out by the constant aggression and agitation, yet I am admonished to stay loving and patient-"it's not really him-he can't help it." Yes he was loving and funny and could do anything around the house and yard, but we did those things together. I am very grateful that he can still dress himself and feed himself and though he is incontinent at night and sometimes during the day, he can toilet himself. but his mind is nearly mush. I bought a few simple games to engage him with. That helps. But I digress. I wish that there were many more informational sites that include the special issues between husbands and wives.