No. Jett is the result of a relationship Hank Sr. had with Bobbie Jett after his divorce from Audrey and before his marriage to Billie Jean.
They are not brothers. However, This has been a rumor for a long time. According to several other websites Charley Pride's mom used to work for the Williams family.
The web address of the Hank Williams Museum is: http://www.thehankwilliamsmuseum.net
Hank Willams died of rt. ventrical dilation as stated in the death certificate. Alcohol but no other drugs were found during autopsy.
The address of the Hank Williams Museum And Festival Inc is: Po Box 310, Georgiana, AL 36033-0310
No. "Mansion Over the Hilltop" was written by Ira Stanphill, a Ft Worth, TX evangelist in 1949.
"Mansion on the Hill" was written in 1948 by Hank Williams and Fred Rose.