Stuart Siblings

What would've happened about the union of the crowns if Mary, Queen of Scots had had other children after James VI (maybe Darnley is merely chastened instead of murdered, IDK). Would England and Scotland still become one crown? Or would/could James VI succeed to the English throne on the understanding that his eldest brother/'s heirs would succeed him in Scotland. Would they be given English titles after 1603? And what Scots titles would they hold? Darnley was duke of Albany, Bothwell duke of Orkney and the only other pre-Hannoverian Scots royal title I know of is duke of Ross (besides Rothesay, lord high steward etc). And how/where would they marry? What effects might they have on politics?
 
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