Succession to the Crown Bill

I think that, in canon law, it may be canon 1125 which refers to best endeavours. Is it not the case that he who brings up a child in the Catholic faith or attempts to do so by using best endeavours is defeated in those endeavours if it be a legal impossibility? So the issue as to the connection of that infant child to the Crown and the Catholicism or otherwise of that infant child is dealt with in that way. Best endeavours cannot be achieved if it is a legal impossibility.