@Ajiood now that you've mentioned it... I don't remember seeing any family with more than 1 kid yet. I mean we did see few married couples, and older families but never more than 1 (adult) child.
Sadly this is not enough to confirm or deny your theory but hopefully they (artist/author) answer this by showing their child/ren.
Sadly this is not enough to confirm or deny your theory but hopefully they (artist/author) answer this by showing their child/ren.