Abby go?

Andrew said his first 2 word sentence this morning and it was "Abby go?" Not Mommy go, or Daddy go, but Abby go? He was sitting on our bed this morning and Abby was playing in the bathroom hiding behind the shower curtain and Andrew looked at me and said "Abby go?" with his arms thrown up like where did she go. It was too cute. He loves his sister and is constently calling for her, so much so that it drives Abby crazy. She will tell him "Andrew you're peating (repeating) yourself" Sibling love.