There will be the absence, by design, of either a mother or a father in the arrangement, ,
Eris, you make a point that we must acknowledge–many, many children today are raised without both a mother and father. That happens sometimes due to death, but more often than not, it’s because of problems like divorce and sex outside of marriage. We have gotten to the point where we are today discussing gay “marriage” because we somehow forgotten what marriage really is. Many never knew.
When we try to defend Church teachings against homosexuality, we must really acknowledge that heterosexuals have done a bad job of protecting marriage in the past several decades.
As a child who had both a loving mother and a loving father, I find it kind of offensive when people suggest one of my parents (usually my dad) was a sort of un-neccessary luxury. Sure, children can get by without both a mother and a father, but it is not the ideal. As the mother, I can attest that I need my husband to help me raise our family, and he needs me. While we could survive as single parents, our children would dearly miss having both of us. People can get by with only one arm, but we were designed to have both a left and a right arm. Likewise with parents, we were designed to have both a mother and a father.
Sadly, many people do not really know the love of* both* a mother and a father, who are married to each other and living in the same home raising their children together. The people raised by single parents may not even realize that they are missing something important. They may think it is okay to place children who have been entrusted to the state for whatever reason in homes without both a male and female role model (aka mom and dad) for the children because that is how they grew up.
I do not write this to slam single parents or those raised by single parents, but to point out that the sins of heterosexuals against marriage brought us to this point. If we had done a better job over that past forty years of defending marriage from sins by heterosexuals, we would not be having this discussion.