Death is not the end of all.

"Then I saw a great white throne and him who was seated on it. The earth and the heavens fled from his presence, and there was no place for them. And I saw the dead, great and small, standing before the throne, and books were opened. Another book was opened, which is the book of life. The dead were judged according to what they had done as recorded in the books.”
(Rev. 20:11-12 [ESV])

It would be most wonderful to see them in the heaven. I think a good advice is to be trusting concerning others and doubting concerning self. Leave your dead relatives to God’s care, and pray for them once or twice. You yourself should trust in the Victor of Death. You can also console yourself that to God nobody is dead. To Him everyone is alive, because He is not bound in the laws of this universe.

Fear not, I am the first and the last, and the living one. I died, and behold I am alive forevermore, and I have the keys of Death and Hades.
(Revelation 1:17d-18, ESV)