"But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope."
(1 Thessalonians 4:13)
The Holy Spirit of Truth speaking through the Apostle Paul here is telling us not that we cannot grieve over a loss of a loved one, but only that we do not grieve as others which have no hope: by what you've said you are one who has hope in the Lord; only we must remember that true hope is in that which we cannot see, not that which we can. The grace of our Lord Jesus Christ be with you and yours.
"For we are saved by hope: but hope that is seen is not hope: for what a man seeth, why doth he yet hope for? But if we hope for that we see not, then do we with patience wait for it."
(Romans 8:24-25)
"For our light affliction, which is but for a moment, worketh for us a far more exceeding and eternal weight of glory; While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal. For we know that if our earthly house of this tabernacle were dissolved, we have a building of God, an house not made with hands, eternal in the heavens. For in this we groan, earnestly desiring to be clothed upon with our house which is from heaven."
(2 Corinthians 4:17-5:2)