history: My parents have not gotten over the loss of my sister. They need to get some help from a trained professional. You know my parents still have not gotten over the loss of my sister. Oh my gosh_comma_ I'm so sorry. May I ask how long ago it was that she passed?  She passed two days after Christmas. She was very sick during the whole month of December.
current: They probably still just need some time. My grandfather still isn't over the passing of my grandmother and that was over a year ago. I would just make sure to keep seeing and talking to your parents to make them feel as loved as you can.
next: I will, and thank you so much for the encouragement.