Will we know our parents?
Children?
Friends?
Ex wives
I believe so. King David said that his son was not coming to him but that he would go to his son. I believe that God will leave us with memories of this life, but take away any sting or regret. We will spend eternity in great appreciation of the salvation that Jesus bought for us at such a cost.
King David knows his son now but at the New Jerusalem he will not know him.
Isa 65:17 For, behold, I create new heavens and a new earth: and the former shall not be remembered, nor come into mind.
Joh 14:2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
Joh 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
2Pe 3:10 But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
2Pe 3:12 Looking for and hasting unto the coming of the day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
2Pe 3:13 Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.
Rev 21:1 And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
This heaven and earth shall pass away and there will be a new heaven and earth.
And the former shall not be remembered, nor come into mind.
The saints and angels will remember nothing prior to the New Jerusalem and it will not come to their mind.
That means you will not remember the earth and the people and anything that happened.
It is a place where sin has never been and sin will never be.
The saints will not remember the former earth because it is associated with sin and rebellion.
But the New Jerusalem is after the millennial reign of Christ so make sure you say goodbye to your loved ones, family and friends, for one day you will not know them.
King David knows his son now but at the New Jerusalem he will not know him.