Does the Bible say anything about our human relations being kept after death? Does death separate us from the people we love forever? Do we keep our human relations or do we start over?

I'm looking for any scripture passages that backup this claim or the contrary.
TL;DR The answer seems to be a clear &quot;Yes&quot; on this matter.
David Legg has an excellent sermon on the subject here, from which I obtained much of this research.
Many people have heard the passage about there being no marriage in Heaven:

Jesus replied, “You are in error because you do not know the Scriptures or the power of God. At the resurrection people will neither marry nor be given in marriage; they will be like the angels in heaven.&quot; (Matthew 22:29-30)

There is some evidence that persons will be recognizable even after they are in heaven. At the Mount of Transfiguration, the disciples with Jesus were able to recognize Moses and Elijah. Legg treats with the question of how the disciples were able to recognize figures who died hundreds of years before their time, but it appears that there is at least the ability to recognize others.
But what about interpersonal relationships? Will we be able to spend time with those we knew on Earth, all while worshiping God forever? 1 Thessalonians 2:19 says:

For what is our hope or joy or crown of boasting before our Lord Jesus at his coming? Is it not you?

Legg also goes into a deep analysis of the consistent use of the phrase &quot;gathered together&quot;, which we see in 1 Thess 4:17 and 2 Thess 2:1. The point he makes is that in saying &quot;gathered together&quot;, the Bible says that we will be participating with our friends and family in worship.
Then the question becomes on what level will our relationships be? We already know from above that we will neither marry nor be given in marriage, but how will relate with those we recognize?
Hebrews 8:5 says:

They serve a copy and shadow of the heavenly things. For when Moses was about to erect the tent, he was instructed by God, saying, “See that you make everything according to the pattern that was shown you on the mountain.”

Because the earth is but a shadow of heaven, that is the reason people are not given in marriage in heaven. Legg says explicitly:

...marriage was a shadow, or if you like a signpost, relating to a greater relationship which is the relationship of the Christian, the church, with their Bridegroom, Christ Jesus.
Now a signpost becomes unnecessary when we reach our destination. You see, marriage, as we have known it down here on earth is a copy, it is an echo of the true, ultimate marriage that will take place at the marriage supper of the Lamb when Christ, the Bridegroom, is wed to His bride, the church. The purpose of earthly human marriage for us down here is in order to point us to that day, and even prepare us for that day in heaven.

The relationships we develop on this earth will not go away when we get to heaven, but they will be deepened with each other, and new friendships can be formed with those that died hundreds or thousands of years before us.
Further evidence is given in the wording used when the patriarchs of ancient Israel died:

Then Abraham breathed his last and died at a good old age, an old man and full of years; and he was gathered to his people. (Genesis 25:8)
And Isaac breathed his last, and he died and was gathered to his people, old and full of days. And his sons Esau and Jacob buried him. (Genesis 35:29)

That article closes with an excellent point:

We will be reunited not only with our own families and loved ones, but also with the people of God from all ages. In heaven we will all be one loving family. The immense size of the family will not matter in the infinite perfection of heaven. There will be ample opportunity for close relationships with everyone, and our eternity will be spent in just that kind of rich, unending fellowship.