God established marriage as a lifelong union between a man and a woman. One purpose was to ensure that every child would be brought up and trained by his biological parents.
Did he not make them one, with a portion of the Spirit in their union?And what was the one God seeking? Godly offspring. So guard yourselves in your spirit, and let none of you be faithless to the wife of your youth. (Malachi 2:15)
Sometimes this plan is disrupted by the death of one or both of the parents. This is unfortunate but it isn’t anyone’s fault. But sometimes the plan is disrupted because of the actions of one or both of the parents. Parents get divorced or conceive children without getting married. Children may end up being raised by a gay couple; they have two mothers or two fathers, rather than having a mother and a father as God intended. These situations usually come about because people care more about their rights than they do about the welfare of their children. There is an organization called Them Before Us that seeks to remind us of our responsibilities to our children both by stories of how children are affected and by scientific studies that show that God’s plan is best.