Clues to recognizing a child with Asperger

Hi ,

A sweet little loving boy called his Grandma Ugly " aren't you ugly grandma"   so hurtful but so out of character and then  a year later called a lady a witch" that lady is a witch"  description long black hair long finger nails a florist , bit my beautiful sister in laws finger out of the blue around 2 years. Was this a normal childs behavior.   We have a daughter nothing every passed her lips in the same manner.  Father is aspergers infact  .