C.,
I have to ask, when this screaming match occurred, had there been some drinking going on? Do the issues your siblings have with you have anything to do with your boyfriend? What could they have against an 8 month old baby? This situation must be absolutely terrible for your parents.
Concerning your baby’s first birthday coming up, should you “suck it up and invite your family”, so your nieces and nephews can attend? NO, you should "suck it up" and call the people with whom you had the “screaming match”, apologize and tell them you love them no matter who started the argument and do not want to be separated from your family. You should do this as soon as possible, so by the time Mother’s Day, Father’s Day, baby’s birthday and other special occasion roll around, you all might have started acting like a family again.
I don’t mean to sound harsh, but if you don’t believe me, run this by your mother. She’ll probably cry and you might too. Being the one that takes the first step is sometimes very difficult, but someone needs to. Why not you?
Blessings…..