WI Edmund Labourde and Martin heir of sicily both survive

If both the son of Henry IV of England and Joan of Navarre, Edmund Labourde and Martin heir of Sicily(Future King of Aragon), the son of Blanche of Navarre from her first marriage survive to adulthood what would be the consequences for the Hundred Years War knowing that both have a stake on the succession of Navarre and Martin heir of Sicily was betrothed to the OTL Queen of France, Marie de Anjou, would this be advantageous to the Valois or the Plantagenets?
 
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