These snakes especially the childrens pythons are so variable in terms of pattern. Without specific scalation differences, why would you asume that your male is a hybrid? It looks just like a dark childrens to me. Without a history, I wouldn't assume hybrid. Like I said above, I have heard rumors that they were interbred back in the day, but I know several people who have tried the cross unsuccessfully. Also if you read much of the australian literature, and papers by Hosier, they do not have any recorded hybrid breedings.
I'm not saying it can't happen, or it never did happen. But I'd like to see a little evidence before I go passing off dark chilrens, or light spotteds, or big anthills as hybrids.
You have a cool thing going on with those light babies. How bout some updated pics!?