should parents be allowed to terminate the baby if heavily disabled?

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I was born totally blind and with a ventricular septal defect (a hole between the two ventricles of the heart).  I was the last of seven children on top of it, with my dad in his mid-50's and my mom in her mid-40's, and I'm sure they didn't expect me (my next-oldest brother had been born a whole four years before me).  They were devoted Catholics, so abortion was out of the question.  I'm very glad to be alive, certainly, and I'm most grateful for everything my parents did for me in the undoubtedly burdensome and trying task of raising me in these circumstances.  But, to be honest, if they had decided to terminate the pregnancy given all of the above conditions, I wouldn't find the decision unreasonable.  My mom and dad had quite enough on their plates without me coming along and adding to their worries.