There’s two issues at play here. Sibs refers to the normal offspring of a pairing involving a jag.

Issue #1 – some people frown upon ssp crosses, whether there are jags involved or not. This partly due to the frequent difficulty in identifying these as crosses. I keep plenty of crosses and smile upon them.

Issue #2 – the term “jag sib” is simply stupid, or an attempt to pretend the snake is something it is not. If you bred a pastel BP, would you call the normal offspring from that clutch “pastel sibs”? No you would not. When jags first became available to the general public there was a debate claiming jag sibs were “nicer” than other normals. Naturally, this was reflected in their price. This was nothing more than a marketing ploy. Some claimed sibs could produce jags. The fact that none ever did was not a deterrent to those looking to make a fast buck. I do frown upon the term “jag sib”.