GPs are not trained to counsel you in either a therapeutic or a mentoring capacity. Moreover, GPs are definitely not trained to know how to deal with a dynamic as complex (and as potentially hurtful) as parental transference. I think your doctor is over-stepping his medical remit and I hope that you don't get harmed as a result, although I am not surprised that he is breaking a boundary as this kind of breach is typical of medical megalomaniacal behaviour. Stay safe and keep your 10 year old close as they don't yet know who is trustworthy.