I’m very sorry for your loss and the pain you are going through all these years, it’s truly heartbreaking and finding the right things to say is not easy. As an older woman I’ve experienced much loss but it’s a normal thing to go through in the cycle of life. When something happens that robs you of those you love it’s very painful and difficult to accept because it should never have happened, unfortunately these things do happen leaving so many people with broken lives. I experienced this with my parents who were survivors of a war that robbed them of all their loved ones young and old, somehow they found the strength to carry on and rebuild their lives again. They had many struggles to deal with but they lived good lives and enjoyed all that life had to offer, they did this in memory of those who didn’t have the chance to do so. I believe that your sister would want you to enjoy the best things that life has to offer and not hurt anymore, she will always be near you in spirit forever.