PTSD (post traumatic stress disorder) flashback

Although these pictures look like they are having a good time together it was just moments later that the high pitched scream was unleashed after xavier started bugging marcella...i found myself having a PTSD flashback to my childhood and my brother. xavier is CONSTANTLY bugging marcella, from poking her in the stomach, to teasing her with his toys and then taking them away, to taking her babies or blanket from her and not giving it back, which just sends her over the edge. now don't get me wrong, he ADORES her, as she does him, but he just loves getting that rise out of her. which brings me to my flashback...my brother was a tormentor...mentally mostly, he really knew how to "get my goat" as my mom would say. she actually banned the word "DON'TTTTTTTTTTTTTTTTTTTT" which i would whine, yell...whatever it would take to get him to stop. Marcella can't say "don't" but she's got the high pitched whine down to a science. all day yesterday i had to keep telling him to leave her alone, she finally cold clocked him in between the eyes to get him to stop and he had the NERVE to be mad at her. thankfully for her she's got me and my PTSD on her side so xavier got in trouble. what is it with siblings and bugging each other for the sake of bugging?! i LOVE my bro to death but i still tell him if i ever became a serial killer it would be all his fault!