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I agree with your statement that parents only have a duty towards the child but not its rights. But is there such thing as a proper social service back-up. Even the police for instance are not fully informed when it comes to such legalities as consent...
It would be interesting as to what stand the judiciary would take. I however wouldn't think that the rules would be the same in both the instances,as in the latter, the patient may be having the capacity to make a well informed, valued judgement ( a la the 'emancipated' child in the context of US and Gillick/Fraser guidelines in the UK).
However, in the context of our subcontinent, the socio-cultural background for most people is different. In most families, children depend (or shall we say it is expected of them!!!) to a great extent on their elders to make crucial judgements. Even if it means that the decision is wrong!!!