Thomas’s family: I'm so sorry for your loss. I went through a similar situation and I was very helped by the hope that I found in the Bible in John 5:28, which says, "Do not amazed at this, for the hour is coming in which all those in the memorial tombs will hear his voice and come out". I am sending you a link with more information on this hope.
https://www.jw.org/en/publications/magazines/awake-no3-2018-nov-dec/
I am very sorry for your loss. My heart goes out to you in this difficult time. One encouraging thought you might find comforting is found at John 5:28, 29. “The hour is coming in which all those in the memorial tombs will hear his voice and come out.” God gives us this beautiful hope that he will soon resurrect our dead loved ones and we can see them again on a paradise earth! I hope this promise brings you comfort as it does me.