There's a kind of innocence that little kids have that makes them simultaneously beautiful and infuriating. The frustration is real when they constantly ask you questions they don't know the answer to.
In this instance with Twitter user @PamTina_, her "annoying" kid brother was the former: absolutely wholesome and pure.
When Pam's younger brother discovered that he and his sister aren't "fully" related, his reaction was an adorable one.
It moved her to tears and left a huge impression, so she decided to share photos of what her brother did on Twitter, where everyone was absolutely in love with his reaction.