I just answered "jestem rodzice" and it got accepted without showing me any typo ... shouldn't this be wrong, as I missed the 'm' for "rodzicem"?
Yes, from what I see it should have actually even been failed. Was that a 'type what you hear' exercise? There is a bug which makes the typo messages not displayed there...
I never get any typo reminders for any "type what you hear" exercises, I always have to look in the comments to check, because the right answer is displayed at the top
Yes, the bug is still there :|
Is rodz at the beginning usually used for sibling rather than parent
Well, all those words are simply related: "rodzina" (family), "rodzice" (parents), "rodzeństwo" (siblings).
"(u)rodzić" is "to give birth", "(u)rodzić się" is "to be born".