I went to my S/O's house because some of his family members were in town and had never met our son (6months). It was over 15 people who were visiting and wanted time with the baby. somewhat overwhelming but as long as my son wasn't whining, trying to get away, I let him be. He would search for me, see me, smile, and go back to playing. all is well. some members didn't want to hold him because he was slobbering a lot, (he's teething) fine by me didnt offend me.The house finally settled down, everyone was watching a movie. (a coupIe of the guys including s/o stood on the porch talking) I walked into the kitchen to grab a drink, As I was walking back to the living room, I hear my son blowing raspberries, as soon as I turned the corner an "aunt" that was holding him SMACKED him in the mouth and said NO. it was a loud popping noise. I couldn't get to him fast enough. I grabbed him and literally lost my mind. I still have no idea what all I said to her, but alot of cussing as I took my son to another room. his cry was delayed, he pouted then burst into a blood curdling scream. I wanted to kill this woman. who the fuck hits a BABY in the mouth for blowing raspberries?!?!? S/O came running in inspecting him and stormed out. I walked back in the room and another "aunt" said DONT be irrational he needs to learn sometimes.. I told her to let me smack her in her face and dont call it irrational. S/O was pissed, immediate family told me I had every right to be angry. She called me dramatic, I dont know how I didn't smack the shit out of her when I grabbed my son OR when she called me dramatic. BUT I held it together because he needed me. They ended up asking her to leave because she became very disrespectful towards several people including myself. She asked could she say bye to the baby and my only response was "hell no". His mouth was red for a couple of hours which angered me everytime I looked at him, he cried off and on the rest of the day. Sons grandpa apologized several times even though he had nothing to do with her. S/O said choiced words to her (still unclear what was actually said) and apologized too. I am still fuming. I could hurt this woman right now.