I'm confused, do you think that "consenting adults" refers to animals? What are you trying to tell us about yourself?
I honestly don't give a fuck if consenting adult family members decide to fuck. It is not my business what they voluntarily do with each other. How and why could/would it possibly be any of my business?
In other news, this is yet another great example of "refurbished arguments against interracial marriage". What I am not seeing in your comment is any rational reason why somebody should want to criminalize homosexual relationships. Do you have any?