Concerning we who are believers and have been raptured. Will we still mourn for our family and friends who were left behind?
There’s no indication from the Bible that after the rapture we will mourn for those left behind. But there is a hint in Psalm 45 that we will not. Psalm 45 is called a wedding song because it tells of the wedding of the Messiah King to His bride. In Psalm 45:10-11 we read the following instructions to the bride;
Listen, daughter, and pay careful attention: Forget your people and your father’s house. Let the king be enthralled by your beauty; honor him, for he is your Lord.