Opinion please!!!

Ok I'm in a very sticky situation right now Since it's Easter today, Happy Easter Everyone who celebrates it.. but my stepdad's family wants me to show up for their family get together for dinner tonight but I don't want to go but yet at the same time I do...what should I do?? I don't want to go because on my husband's (my fiancé's) side of the family is dealing with a hard time...my husband's stepmom is slowly dying of Cancer and is in the hospital right now and we were told that last week may be her last but we are lucky enough she's still with us and she's still fighting it and we don't know how much longer she has left so right I'm in California  and my husband and his family is in England right now so I cant physically be there and the only way to properly talk to him is through xbox360 and Facebook.. the other day my husband tried to off himself but never did and apologized to me for it but the reason why he did it cause of what his dad said to my husband, when he's going through a difficult time as it is, on what is occurring to my husband's stepmom, his dad said, "that you don't care about anyone but yourself, you only cry cause you feel sorry for yourself, you need to grow up because you like comic books and your the reason why your stepmom is in the hospital" who the hell says that to someone losing family? my husband cares about me a lot, he cares about his little sister's a lot, and so what if likes comic books that doesn't make you a kid...so when I heard that I thought that was fucked up of his dad to say that to him, so i want to comfort the man i care about and then the other half of me says go the celebration cause I don't want to upset my.. step-side of the family?? is that how you would call it...I don't want to hurt anyone...but either way I go's I hurt somebody what should I  do celebrate Easter or comfort my love? My heart say comfort my love and my gut too but something is telling me to trust my husband and celebrate Easter....please anyone if you were in my situation what would you do?