What's in the Meaning of Family?

I've had a lot of time to reflect and think about what it means to be a part of a family and to have a family of my own. I seem to come up with many questions. Here are a few of them.
Why do we become a part of a family anyway?
Is the family unit on earth a temporary thing?
If family is forever, why do the kids go away to be on their own?
(Doesn't that leave the parents alone?)
Mormons believe that the family will be together for all time and all eternity. I don't think that that belief makes any sense. A man and a woman (Mormon) are to become one, get sealed in the Mormon temple and then have many kids. In that whole process, the parents are leaning on the belief that they will have their children forever. How can that be at all possible if their children want to go on their own and fulfill the same dream of godhood? It isn't at all possible. Think about it. If you are Mormon and you believe that you will go to the celestial kingdom and receive your glory of becoming a god to have your own world and have an endless number of spiritual children, where does that leave your earthly children? The earthly children are off doing their own thing. They don't want to stay at home with mom and dad. They want the dream of godhood too (If they believe). Therefore, the whole thought of 'families are forever' is a joke.
God put humans in a family unit for stability and learning. Parents are to teach their children how to be adults and continue the same cycle that has gone on for centuries. I know that children are not to stay at home with their parents forever. That just doesn't go with what God intended for us in the first place. Maturing and growing is part of what God wants for all of us. Even Jesus himself said that man is to leave his father and mother and be united to his wife (Matthew 19:5).
A good portion of my life was spent in the belief that I was going to be a part of my family forever. I believed that I would never be without my brothers and sisters, my parents and grandparents, my children and grandchildren, and so on and so forth. I believed that I was going to be with my family of generations past, present, and future. The list was endless. I think of my family tree and it is huge, who's isn't?
I have my children in my heart. I don't have them physically. No one does. Children want to grow up. They want to be themselves, not what I want them to be. When they find God and turn their life over to God then they belong to God. God is the only one that has them. He always did. Their lives are in His hands. I can't do what He does and I can't possibly know what the situation in Heaven will be. Nobody knows.
The whole bottom line of all this is; teach your children well in the ways of the Lord. Show them what they need for their future. Allow them to mature and grow to become the adults they need to be. Families are a group of people that are there for that process. As far as forever is concerned - Let God do His work and forever will fall into place. All those that believe in the Lord belong to the greatest family of all...