Hey ,im sorry to hear that your feeling sad atm,its understandable though and im sure everyone on tibb i here for you if you ever need a chat

Ive never actually been through this but when i was little my dad wasnt around alot although he was still married to my mam and lived in our house,he just never took any interest in me or my siblings anyway when i was 11 my mam found out that my dad had been having an afiar with another woman for three years and she was pregnant.They argued obviously and things were chaotic at home,but they went to marriage guidence and the woman he had an affair with had an abortion so they`ve never actually split up.I can sympathise with you a little though becuase of what happened in my childhood and basically id just say,time helps,in a way your lucky becuase your parents are still on good terms and they seem to have your best interests at heart so arguments will be kept to a minimum if at all.Things will be tough for you at first but your parents will be sympathetic to this and even though you say your sisters moving away to uni this happening could actually bring you both alot closer together.
I hope your feeling happier soon and remembr its normal to feel this way right now don be ashamed to talk to people,your parents,sister-it will probably help a great deal