James V dies leaving a infant daughter, Mary, by his wife, Marie de Guise. He has no surviving sons.
His cousin, John, duke of Albany died in 1536. However, John (either through having kids by his first wife, Anne de la Tour d'Auvergne (aunt of Catherine de Medicis) which according to his wiki he had a legitimate daughter who died in her teens; or through remarriage) has kids of his own. My understanding of it is that John's son(s) stand in the Scots' succession ahead of their cousin Mary. John's son succeeds as James VI (more likely Alexander IV, since the Albanys didn't even name their illegitimate sons James), and new king Jamie/Alex has some sisters to provide for.
Where do these sisters marry? (Obviously this might depend on their mother, but let's assume it's one of James V's cast offs, like Marie of Bourbon or one of her sisters) And would Mary of Scots (James V's daughter) still be a good catch for the French dauphin in this scenario? Or might one of the new king's sisters fit the bill better? And Mary gets sent to London as was intended by the English