Why does Amber call Jackson her brother, Ailee her mother, and Min her 'zombie buddy'?

On the February 24 edition of Mnet's '4 Things Show', Amber gathered with her closest friends, including GOT7's Jackson, Ailee, and miss A's Min!

Amber said, "I hear a lot that GOT7's Jackson and I look like we're twins.  I always met up with him during training days, too.  He's a friend who is like my younger brother."

Jackson added, "Amber is a precious person to me.  I told Amber 98% about myself.  I, likewise, know a lot of Amber's secrets."  Oh, do share.

Additionally, Amber said about Ailee, "She's like a mother to me.  When I'm not working diligently, she lets me know."

Ailee said, "She's a close friend with whom I can have fun talking until the sun rises."

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In addition, Amber revealed she and miss A's Min were "zombie buddies."  Min said, "Our promotion periods were similar.  Whenever we promote, we don't get to sleep properly so whenever we meet up, we looked like zombies."