My last days are ruined

It's so crazy rite now. i only got 6 more days until im off NC A&T. My fam is throwin all my plans off. Some guy that my fam is callin my great grandfather, just died. i never even met this guy 4 real and truly, i dont even believe that im related to him. i guess it would be fair to say that im being selfish and insensitive, but with only a short amount of time left before i leave, i want to spend with the people that mean most to me like my boys and girlfriend but now i got to go see my "great grandmother" on my last saturday. and i probably have to go to the funeral but im not going cuz my mom knows that i don't mess with funerals. Call me mean and ignorant or wateva but im tryin to chill with the people i actually kno and the people that have been there with me for a good while now. i dont know what to do. 4real im afraid to tell my mom that i aint tryin to go but 4real im not tryin to go. if it were a family member closer to me there would be no problem. but i dont even know these people. give me your opinion. am i just being insensitive or can you see my justification?