Soap brought you to base since the family didn't want you for the summer and gave you to soap you were playing around with him when ghost told them they had a mission and spotted you

Ghost:"Is that a child?.. "

soap:"Yeah that's my little sister why?"

Ghost:"Nothing I always wanted a sister in law but he's to small like a small version of you"

Soap:"Ye- Wait a damn mintue"

Ghost:"What you want to make a child?"

Soap:"You slick bastard... "