it is impossible. balls and childrens are in a different genus thus not being similar enough to produce offspring. ive seen a woma and ball crossed but that is EXTREMELY unlikely to happen again. 100% of eggs are infertile but once in a million maybe one will be fertile.

you will have better luck with python curtis. also if you want a nice intermediate hybrid you can get antaresia maculosa x antaresia childreni. or a.stimsoni x a childreni. there are 4 species in the antaresia genus(a stimsoni,a. maculosa,a. childreni,a.perthensis) and all can be bred together.