Ah man, I was so hoping it wouldn't turn out like this! I'm so sorry about your cousins, Freddie! I guess that if there is any comfort to this unfortunate situation, is that their bodies were finally found and you won't be wondering for the rest of your life what happened to them or where are they.
Prayers to all of you Freddie!
P. S.
I just wanted to add, Freddie..... several years ago, my first cousin's daughter disappeared after attending a party. The investigation went on for years, the whole family, friends, etc., searched and searched for this missing girl and she was never found. She left behind a two-year old little girl too. The profound saddness in her parents was so heartbreaking to watch and hear about. They both died never knowing whatever happened to their daughter.
To this date, 25 years later, her body has never been found.