Early onset Alzheimers, father in law only in his 60's

My father in law was diagnosed about 6 years ago. He is only in his 60s. He still lives in his home with his wife. But things are getting more difficult. He stopped driving 5 yrs ago. He has lost interest in most of the things he used to do. His biggest issue over the last few years is finding his words and following conversations... Even when its one on one and simple. He putters around the house mumbling to himself. Often looking lost and confused. He used to be very organized and particular about his belongings and now is seemingly more careless and doesn't keep his stuff 'just so' as he always did before. He's often grumpy. He has poor vision and can hardly work the microwave anymore. His wife has to get his clothes out for him and direct him to shower etc... Though he does clean himself and do his personal hygiene on his own. But certainly requires direction throughout the day. Can only be left on his own for a couple hours. We are concerned about when the right time is for him to go into care or bring a worker into the home. My husband seems to think that he will be in care by the end of the year but his mom seems to think its still a couple years. I'm kind of in the middle.... I can see it starting to become tiresome on my mother in law. She also takes care of our daughter and nephew twice a week so its almost like having three kids. We want them to think about the future sooner than later and help them figure out a plan. I'm curious to know how this will all play out.... Any thoughts on how rapidly he could decline? He has clearly taken some backward steps in the last year. It's very sad and I know more challenging times are ahead... Though unsure what to expect. My husband feels like he's already mourned his loss.

He's not a vet...and we are in Canada so I'm not sure how things are different here with assisted living etc.

Hubbys mom would never admit if the kids were too much for her..shes just that kind of person. Which is what I worry about. Kids are her life. She raised three of her own and has run kindergym programs for 20+ years. The kids are what she wants to hold on to..they keep her young and free. But of course she has a husband to take care of and we often remind her to be honest and let us know,if she needs a break. But she is the kind who doesn't ask for help. She just pushes through. One of the strongest women I have ever known.

It will be an interesting,couple of years trying to sort it all out. My younger sister in law is still living at home but starts her next semester of college in Sept and feels she needs to get out of the house in order to succeed in her studies but she is riddled with guilt about it. We told her she needs to do what she needs to do and we are here to help support all of them. We may offer our condo to her and offer moving into the house for extra support..but we will have to see what they want.