Sandy, I think that Jim and Slim are different people but have no idea if they are related. I do think there is some resemblance but am no expert in these matters.

Some interest in Bill Haley has been shown here. I am no expert there either but several years back I stumbled upon several reissues from Haley's early days. Back in the 1940s before he became a rock and roll icon, Haley's primary interest was country and western music. Early bands bore the names of Texas Range Riders, Four Aces of Western Swing, and the Saddlemen.

He recorded such songs as Wreck on the Highway, The Covered Wagon Rolled Right Along, Ten Gallon Stetson, Yodel Your Blues Away, My Palomino and I, and Candy Kisses.

Here is a link to one of those reissues.

Bill Haley