This is not a maths question. All you can do is
attempt to speculate with statistics, but there are so many variables, and you had such a few amount of results, that the question pertains more to biology & genetics. Whatever conclusion you get
solely from statistics (just with the info you provided) will be an illusion & hardly worth considering.
In other words, would be better to determine if there is an increased possibility for you to have kids in such unfavourable state by actually analyzing your body/genetics (which is one of the root causes for that to happen), not with your random 2 samples, which are not very telling; your next kids could be easily perfectly normal, we don't know.
In regards to morality, it is subjective, but my opinion is that it is selfish if there is a substantial possibility of that happening, it will just bring suffering.
And it really is painful, to know that your parents were selfish and that's why you're in pain, but there are several degrees to this.
Made a
thread about a similar thing, but have to say that overall, Kiwifarmers here are pro-having that baby, yet I'm personally not convinced. I know how painful it can be for your parents to be careless/selfish/assholes.