Board Thread:Speculation House/@comment-25991826-20161106194758/@comment-25936766-20170209014659

205.185.99.154 wrote:

Don't make it a twin brother, make it a younger brother. Raven could have been pregnant with him before Tai knew about it, and then she could have had him after she left. Raven left them shortly after giving birth to Yang.

If any hypothetical siblings were not born right there and then, they never would later. That's not how pregnancies work, after all.

The only way that idea could happen is if Taiyang and Raven had sex literally within days of Yang having been born.