Helping the In-Laws

So, my husbands parents are going through a hard time. Their health is almost rock bottom. My father-in-law can no longer work because of his health. My mother-in-law has to pretty much retire because she had to take care of my father-in-law. The medicine that they need to stay alive is now totaling more than what they can afford, but they must have it to be able to live. My mother-in-law cannot walk very well because she has put off getting a knee replacement and now her leg is past the point of repair and will more than likely have to have it amputated. I have been thinking about this for a very long time. I mentioned it to my husband yesterday while he was at the hospital with his parents. His dad was having a port put in to start dialysis. But I think it would be best for them to move in with us. My husband and I cannot afford to pay bills for 2 houses but we can one. If we can get them to move in with us then they would not have rent, power, or a cable bill to have to pay. That would save them $700+ by my rough calculations on what they pay a month.

I guess what I am asking is, do you think I am doing the right thing? I want them to be able to see their future kids one day and if they cannot afford their meds then they will die never being able to see them. Plz be gentle with your answers, this is a touchy thing and I need serious input. I feel like I am doing the right thing, but my husband worried that our marriage will suffer due to lack of alone time together. I feel like if we work together our marriage will be stronger after the fact.