Xs are often used at the end of a message or letter for 'kisses'. X is also used to replace the word Christ in a shortened version of Christmas, since the letter X in Greek stands for the first letter 'chi,' which is the beginning of their word 'Christos" or Χριστός.
In any case, granddaughter Mila is deeply in love with Madhu, and covers her with kisses, while both wait for Christmas.
See other Xs on ABC WEDNESDAY.