Do we want to?

There is a sibling pair here in the PNW I have looked at. The youngest is close to my youngests age. The youngest has some muscle tone issues. He is about 12-14 months behind developmentaly. I have done some reading up and the muscle tone could be because of MD, CP or aoms other underlying disease. Not knowing the history of the child and the testing he has gone through I will not know. All I would have to do is get more information and I would know one way or another. Why don't I want to know? the turmoil of having to possibly say no.