I am not pretending that the “love” between parent and child is the same as that between spouses.
I am merely pointing out that there are a great number of factors that make the relationship between same gender individuals vs a man and a woman completely different.
There is merely one factor present that may or may not be the same and that is love,
(And one can even argue based upon statistics that even that factor is different
If the “love” is the same then why is there so many more “break ups” and unfaithfulness in those relationships then in same gender relationships? but that is a sidebar)
However the presence of love does not make the relationship the same for if that was the case any relationship with “love” would be called a “marriage” and conversely any relationship without “love” would not be called “marriage”.
If two individuals marry for money or social status shall we stop calling that marriage!
Of course not!
A woman and man who wed are married because that is the term that has been used for generations to describe that unique and different relationship, just as a table is called a table and a chair is called a chair.
A chair is not called a table because it may have a flat part to it and table is not called a chair because it may have legs.
Put simply I find it absurd to thing the same term that is used to describe the marital relationship between man and woman can be used to describe a completely different relationship, that between two individuals of the same gender.