Just an update - I sent all documentation concerning the medical refusal including conversation transcripts, an explanation with a background on my situation and also a notarized document surrendering my right to sponsor. The immigration officer has required that I provide proof that I don't have custody. I am from the UK and we don't have custody, we have parental responsibility which means fathers have a right to see their children but that doesn't mean the right will be honoured as the mother has the automatic responsibility if that makes sense. I have looked extensively online about how I can provide proof of a custody paper and in the UK they do not exist. Do you think I should send a letter to the immigration officer explaining this?