Family problems.. i really need advice please?

my sister and her fiance started a whole fight with my boyfriend and i because my boyfriend doesnt like her fiance. we have tried ignoring her and even telling her we dont want to talk about it. well my parents are on mine and my boyfriends side bc you cant make two people lke each other. my dad got woken up one night when my sister was yelling at me and the next day asked what we were arguing about. well now my father wants to get my boyfriend and i and my sister and her fiance together to talk about this, when he fully agrees with my boyfriend and i, but my boyfriewnd refuses to come over and talk about it, he says he hates my parents and wants nothing to do with them, that this situation was none of their business anyways. he hates how im 18 and myparents dont let me go on camping trips with him or go anywhere with him that will be 18, he says im an adult and am whipped and to good that i need to break the rules. how can i get my boyfriend to just sit dow and talk about this, im so upset about this but he doesnt care because he says i cry about everything. please give me your opinion