I know it has been a long time since this thread was posted but I thought I would just send a message.
I've been a tattooer for 10 years and have done some special research on women tattooers. Maude, Gus' wife is considered the First female tattoo artist in the United States.
If you are still looking for information on Gus try Chuck Edlridge -- he is the tattoo community's foremost historian and I know the large museum and archive he has will have more information on Gus. http://www.tattooarchive.com/
Madame Chinchilla also wrote the book "Electric Tattooing by Men" and I'm sure there is info about Gus in there as well. http://www.amazon.com/Electric-Tattooing-1900-2004-Madame-Ch...
-- link to the book.
Also I know that the last tattoo that their daughter Lotteva did was on Tattoo artist Don Ed Hardy before she died in 1983. He knew her and it's possible he knew Gus, but I'm sure he knew OF Gus. I would also check with Lyle Tuttle - - it is quite likely that Lyle knew Gus. Lyle is considered by some to be the grandfather of the modern tattoo movement and as an Old School tattooer from the 40's, I'm sure he would know of Gus or know people who did know him -- these guys are getting up in age so don't wait to contact them :)
Your family is a very important part of US Tattoo History!
I am currently curating a small art show with a history retrospective on Women Tattoo Artists and Maude and Lotteva will be featured. That is how I found you.
Black Iris Studiowww.blackirisstudio.com