I had no idea that Peter Graves and James Arness (Gunsmoke) were brothers until I heard a joke on Mystery Science Theater 3000. I thought they were goofing off so I looked it up and sure enough they are siblings.
Really? Going to imdb to compare their pictures. What a contrast as far as their personas. Peter Graves and James Arness brothers?? Wow! That doesn't compute.
James was definitely the better looking one imo. 6'7" tall!
Peter was 6'2". Not bad genes on either of them.
I got into the habit of quoting the post to which I was replying, but it's really not necessary.