How do I get my parents to move out of this nasty house?

Its time for renovations if the roof is collapsing the roaches mice they will get sick Im surpised they did not condemn the house, We had mice in one of our apts >My sons wife called the board of health on me.I told them that she was harassing my family and she was retaliating because ,she was fighting with my daughter,Well anyway I told my son that where I once had a dryer vent there was a hole under the siding .I think thats where they were comming from.Later years the apartment was renovated and we did find an old nest in the rafters which i believed thats were the mice came from it was in the same area of the dryer vent.I do know of some people who lived like paulpers lived without upgrading their house they had other rental properties also.When they passed there was so much money found in a closet was $9000 from a graduation the mother put the cards away and forgot. Then there were stocks$ 600,000 and +bonds insurance policies the Mom died first 3 months later the dad died The bank called the daughter because the Dad was buying a new truck for himself paying by cash, he was getting senile he bought it and died a month later.anyways my friend said she could,nt belive how they lived like paulpers but yet they had so much money.I think they wanted to give it to the kids,and make sure they had a good life they already had homes that were bought and paid for.Maybe this is why your parents are not renovating.