was he still doing that up until the time of his death? Is his brother still alive, the one that was afflicted with Cerebal Palsey?

I remember I used to love watching the telethon when it first started...seeing John and his then wife Nancy.

I belive he did it with Henry Winkler a few times

I belive he did it with Henry Winkler a few times
Yes he did in fact.

I used to watch it sometimes.

Yea his brothers still alive I believe. I remember they talked to him right after John's death.