I'm a Anthis/Antis, etc... researcher and I'm in touch with many other researchers, who are, like myself, also blood Anthis', and I believe he could definitely is part of the family. We just have to find the one person he is connected to.
I will print out your inquiry and keep looking. I'm not a researcher that searches just for my line; but, for the entire tree and all the limbs.
I hope we can be of some help to one another.
Jennifer Hatfield-Knowles
JAHKANDY@aol.com