"My Mother Was A Test Tube, My Father Was A Knife"

Heinlein was prescient. Kids born through IVF do experience consequences as this presentation makes clear:

When I do presentations on in vitro fertilization, audience members sometimes ask whether test tube babies experience psychological problems as they grow up. Although they clearly face elevated health risks for a number of diseases and physical disorders, the psychological effects on these children have not been thoroughly studied.

Nevertheless, children born from other, closely related technologies, like anonymous sperm donation, are starting to be tracked, and researchers are finding that these children face significant difficulties in dealing with their feelings and emotions as they grow older. They oftentimes struggle with their own sense of dignity and identity, with their need for a father, and with a desire to understand their family connection...

Another young person in the same situation poignantly comments:

I am a product of sperm donation and I can tell you that I always hated growing up without a dad. I can’t tell my mom how I feel because I said something to her when I was little and she got very hurt and upset and tried to explain to me that a lot of kids grow up without dads and kinda went into all of this women can do this and women can do that and most women really don’t need a man and blah blah blah. So I now keep all of my feelings to myself. I can tell you that for as much as I love her, inwards I still hate her for doing this to me and thinking that she had a right to decide if I needed a dad or not.

All children deserve to have a mother and a father as they grow up. We should never intentionally choose to set up situations where a child will be conceived in a manner that deprives him or her of a parent. Every child, moreover, is entitled to the full respect of being conceived and brought into the world only though the marital acts of committed parents, through the intimate, loving embrace of husband and wife, not in petri dishes and test tubes.

Because awareness of our own human roots is critical to our sense of personal identity, and because of our vulnerable "sense of self" as humans, we have a particular responsibility to avoid creating a subclass of those who have "different origins" from the rest of us. It ought to come as no surprise that subtle psychological burdens may be placed upon children born from donor sperm as they subjectively struggle with broken or absent relationships, and experience a sense of being a "commodity" or an "object" because of how they were created. These dark and morally troubling aspects of modern reproductive technologies need to be more fully acknowledged and discussed in our society, as they unleash powerful forces that profoundly affect the future of the human beings who are thereby brought into the world...

One more piece of evidence for the foundational nature of marriage and the family, preexisting all societies, and so not subject to "social construction." The forms may be tinkered with to a very limited extent (polygamy, etc.) but such adjustments are only slight human modifications of an independently preexisting reality. Marriage and family are not social constructs.