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The Monegasque RF (Monaco) has twins, one boy, one girl and the boy is the heir.
I believe he was second born (would have to check) but he is a boy. If there are two boys, the first born is heir and the second the heir presumptive.
Girls don't count. lol Well, sons are preferred over daughters when it comes to an heir. Even in Britain, even in 2019.
IIRC the rule of male primogeniture for monarch was changed just before George was born, so that William and Kate's firstborn would not be knocked down the list for a younger male sibling.
For the Queen's children, when Andrew and Edward were born Anne went down a place for each male sibling. But that didn't happen for Charlotte when Louis was born.
If Baby Sussex is a girl, the only thing that can push her down the line of succession would be a fourth child for the Cambridges...until of course the Cambridge children marry and have their own children. But a subsequent brother wouldn't change the succession position of a girl firstborn for Harry.