WI: Conan II of Brittany had married?

One thing that I am baffled with is the reason why Duke Conan II of Brittany did not marry. At his OTL death at 33 in 1066 by poisoning, he apparently had an illegitamate son according to what I can find.

http://fmg.ac/Projects/MedLands/BRITTANY.htm

CONAN de Bretagne (-[Anjou] 11 Dec 1066). His parentage is confirmed by the necrology entry which names his mother (see below), read together with the sources which confirm his mother's marriage. He succeeded his father in 1040 as CONAN II Duke of Brittany, but was deprived of the duchy by his paternal uncle Eudes. He retaliated, captured Eudes and imprisoned him in chains, confirming himself as duke in 1057[163]. "Abbatissa…Addela…soror…Alani Britannie ducis" issued a charter dated 1050, before "Conanum comitem…eius nepotem", relating to the rights of the abbey of Saint-Georges de Rennes[164]. The Breton/Norman war of 1064/65 was triggered by the rebellion of Rivallon de Dol, who was supported by Guillaume II Duke of Normandy. Robert of Torigny records the death in 1066 of "Conanus dux Britanniæ"[165]. The Chronicon Britannico records the death in 1066 of "Conanus dux Britanniæ filius Alani"[166]. Another manuscript of the Chronicon Britannico names "Comes Britannorum Conanus iuvenis et maliciosus" when recording that he attacked Anjou and died there in 1066[167]. The necrology of Chartres cathedral records the death "III Id Dec" of "Conanus Britannorum comes", stating that "Berta comitissa mater eius" donated property for his soul[168]. Conan had one illegitimate son by an unknown mistress:
i) ALAIN (-after 1075). "Alanus nothus filius Conani comitis" witnessed the charter dated 1075 under which "Berta comitissa Alani Redonensis ducis uxor" donated property to Sainte-Croix de Quimperlé, for the souls of "filie nostre Hadeuis comitisse Hoelis ducis Britannie conjugis et…filiorum suorum, meorum…nepotum Alani et Mathie"[169].

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Conan's death could be butterflied in a number of different ways, but I wonder what the implications for the medieval Bretons would be if Conan's line had continued than rather through his sister Hawise and her husband Hoel.

PistolSO said:

Conan's death could be butterflied in a number of different ways, but I wonder what the implications for the medieval Bretons would be if Conan's line had continued than rather through his sister Hawise and her husband Hoel.

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If Conan's son is maintained as duke, the middle-term changes may have been a more distant, if not hostile, Brittany when it came to Normans, and a closer relationship between the ducal house and the king.
Immediatly tough, Hoël (Count of Nantes and Cornouailles) is still going to have the upper hand in a Brittany where many nobles leaned to Norman side. It's not really implausibly to see him attempting to take the power, on the line of fights between Cornouailles and Rennes Houses.

Macro-historically, it would probably not change much, as you either end as a similar situation than IOTL, or butterflying away somehow the Plantagenet takeover.

As for why Conan II didn't married...It's possible he did, and we don't know it by lack of sources, and that the passage of ducal title to Cornouailles is more politically based (critically giving "bastardy" wasn't that of an issue at this time : you could ask William about it)