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The Western Liang's founding emperor, Xiao Cha (Emperor Xuan), was a grandson of the Liang dynasty founder Emperor Wu of Liang. As a result, Western Liang is usually considered a rump state of the Liang dynasty after 557. From 555 to 557 the two states claiming the political orthodoxy of the Liang dynasty existed simultaneously: Xiao Cha ruled from Jiangling, while Xiao Yuanming and Xiao Fangzhi ruled from Jiankang. Before 555, Emperor Yuan of Liang also ruled from Jiangling before he was captured and executed by Xiao Cha and his Western Wei backers. However, he is considered a Liang dynasty emperor rather than a Western Liang emperor because, among other things, he (at least nominally) controlled a much larger territory.
The Western Liang had three emperors: Xiao Cha (Emperor Xuan), Xiao Kui (Emperor Ming), and Xiao Cong (Emperor Jing). From 617 to 621, when the Sui dynasty collapsed, Xiao Cha's great-grandson Xiao Xian occupied the former Western Liang territory (and more) and proclaimed himself King of Liang, but his short-lived state is usually considered separate.
Some historians consider Western Liang as a continuation of the Liang dynasty since it was founded by Xiao Cha (Emperor Xuan), a grandson of Xiao Yan (Emperor Wu), the founder of the Liang dynasty.