No he didn't, back then there was no such thing as pre-existing conditions....Second of all, Fred Jr. and his family were all very well off to begin with.
This was nothing more than a pissing contest between the trump adult family and the children of the Fred Jr. who died an alcoholic.....
You are wrong to say that back then there were no preexisting conditions that affected insurance. I lived that with my own child. We could not get insurance because of his congenital heart condition.
No they weren't. Fred Jr. worked in aviation and was a pilot before his drinking forced him to give it up. He died in 1981 in poor shape financially. Supposedly Fred, Sr. didn't like his daughter-in-law so no support had been provided after Junior's death.