[While I personally know several half-orcs (or, Emperor preserve us how the fuck did this happen, half-orks), half-elves and... Eugh, half-dwarves, I am personally against seeing either myself or my children having any sort of relations with the mer races. It's not against them, I understand they're all wonderful individuals and I respect their culture greatly, but I simply can't imagine raising a half-orc or half-dwarf to be a mindful and productive member of society, or teaching a half-elf to be able to eat a fuckin' cow for once.
Now, before you label me a racist, please understand-- I love all the mer races. Really, I do! I just think that humans should remain humans, orcs should remain orcs, and elves should remain elves. We don't need to stir the pot, who knows what kind of strange defects would come from two incompatible races deciding that they love each other and producing offspring? Why, in several generations, all semblance of order would be lost!]
On a more serious side, as a genetic mutt in every sense of the word, this thread has suddenly made me feel extremely thankful for a (mostly) clean bill of health.
Now I admit, some of the marriages in my immediate parents-grandparents ancestry were probably not perfect; because hot damn, dear pops had a bill of health that could hit the floor from holding it shoulder-height... But, fuck, my parents were in love and married in a subculture that didn't care about race, so I'd gladly have taken the genetic hit for them to be happy and spawn me. They loved each other, dearly, and God knows they loved me-- not once was the thought of genetic disease brought up when discussing a child. Fuck genetics, fuck race, fuck all'a'is nonsense, if someone means the world to you you'd take every disease life throws at you to be with them.
To be fair, though, I did pass up on a lot of the diseases I should have inherited from the various stages of fuckery my lineage has, so it's easy for me to sit in my (un)comfy chair and repeat the things my parents told me. Mayhaps I won the recessive gene lottery, and my child is going to be the one that inherits all of the defects that I had no idea existed, la? Truth is, doesn't matter to me. Whatever human I decide to have give me a child is going to give that lil' fuck the same love and care that brought me to love him/her, else I chose the wrong person to raise a child with.