Bravo to the family. Of course, the best and most direct way to eliminate genetic disorders is to sterilize anyone with the gene, but this gets the job done as well without limiting the genetic advancement of the population by sterilizing so much of it. I have a pretty OBVIOUS and NOT-VAGUE position for the whole baby vs fetus argument. Life begins at the same spot life ends. Any truth is the same viewed from all directions. You must have neural activity to be considered alive. If you don't, you're dead. Birth is just the opposite of that. If there's no neural activity (thus, no consciousness), stem cell research is fair game. Genetic manipulation is fair game. Abortion is fair game. In all reality, abortion would probably be a good source of the former. Natural selection is a nasty process. If you don't advance, you will die out. Pregnancies that will lead to problems (social, pathological, etc.) SHOULD be terminated, hopefully learning from them. If we truly want a world where people are smarter and healthier, we must do it. We already thwarted evolution with contraception. We have to take it into our hands.

By "niche", I believe you mean "expensive".