More of Mac's birthday party

I think Scrubs said it best:

Turk: What comes before Part-B?
J.D.: PART-aaaaaaayyyyyy!

 Not sure exactly what is happening here, but I think someone is trying to get a hug.

 That's either a booger or cake up Mac's nose. 

 The Grandmother's getting Mac to smile. Notice how the drool stain has grown. Thank you for showing that so clearly, grey shirt. 

 "Who's muh little Bulldawg? You are! You are mommy's little Bulldawg!"

Mac showing Poppa how to play with his toys.