Meghan Markle literally has the worst family ... except her mom! But seriously, why can't her half-siblings and her dad and whomever else just shut up?!

Markle's half-sister Samantha Tweeted the most childish, ridiculous thing this morning -- an animated gif of a hamster eating birthday cake with the caption, "Happy birthday, Harry! As you "Mack down" on your birthday cake, think about the birthday wishes you never extended to your FATHER-IN-LAW." Ouch, right? Hell no! Harry's father-in-law Thomas did all kinds of weird sh*t leading up to the royal wedding including a set-up with the paparazzi, a whole bunch of nonsensical statements about the wedding leading up to Meghan's big day.

Let the poor girl be a princess and retreat!!!