Firstly, this question is more in regards to tort law, not family law. Secondly, your advice will depend on where you live because of differening laws. Generally though, in order to prove negligence you need to establish that the doctor had a 'duty of care' towards your son - easy enough. Then you need to prove that he breached this duty of care. This is very difficult to establish in terms of a doctor patient relationship. Basically, he would have had to have been grossly negligent for him to be liable. If the doctor is able to prove that what he did is common medical practice, and generally done and accepted, it is unlikely that you will have a claim. You also need to prove that your son suffered 'harm'. depending on where you live, there are different 'standards of harm' that will apply, for example, being hit by a car resulting in paraplegia is alot more harm than a broken bone that heals eventually with no long term effects. You would need to consider also the cost of running such a difficult case in terms of what you would actually recieve if you won. Your best bet its to obtain further proffessional advise as mine is with a disclaimer that i do not know all the facts of the case.