Looking for any help/advice.. please?

Well, God bless you first off and you have to recognize that this is not a child problem, but an adult problem and their behavior is disrespectful and unacceptable. I don't really know why they are acting this way, but you did not cause this so don'tlet it drag you down--you've done nothing wrong. I think they see your Granpa's fiance and you as a threat to their "inheritance" and don't like it that you and your Grandparents love/loved each other so much and they are such a mess. Stop trying to fix this because it cannot be fixed. You can love and respect your mom and family but you don't have to take their crap. I wouldn't argue with them or anything like that, but just turn them off in your head when they start in, or say you have some place to go or something to do when they start in. Most of all, don't take this stuff to heart because by doing so they are killing your spirit and your rightful joy for life. In a few more years you'll have more freedom to do what you want and be away from them and out of their control. Keep your eye on the prize, which is your future. Your job right now is to study very hard in school and do your very, very best and you can make it be in honor of your Grandma. Start thinking about what you'd like to do "when you grow up." Do you want a trade like an electrician or plumber or do you want to go to college. Once you have a general idea, talk to your counselor at school and ask for guidance. You can also make an appointment with your guidance counselor to talk about your grief and how to deal with it. Like my little Granson says, "she makes you feel better." Bottom line--you can only control yourself and how you feel and react to adverse situations. You can't change anybody but yourself. Keep a positive attitude. Pray to God for strength and guidance and talk to your Grandma because her spirit is all around you. If nothing else, say, "God please help me."