No, Zilong and Chang'e are not siblings.
In the established lore, Zilong and Chang'e do not share a sibling relationship. Their connection is famously based on the story where Zilong saved Chang'e, which signifies a bond built on protection and assistance, rather than a familial one of brother and sister. This narrative forms the foundation of their interactions within their shared universe, clearly distinguishing their relationship from that of siblings.
