Have CGs sister ever really been in line of succession? I'm not sure of it. Could have one of them become Queen if they married right but CG married wrong? If not it doesn't matter when or whom they married.
No, the King's sisters were never in the line of succession as, between 1810 and 1980, succession to the Swedish throne was strictly agnatic, i.e female dynasts and their respective descendants had no succession rights. Carl Gustaf had two uncles though who gave up their place in the line of succession to marry "unequally". And Prince Bertil, Duke of Halland, who served as Carl Gustaf's "foster father" during most of his young life, didn't marry the Welsh commoner Lilian Craig until Carl Gustaf was already King and had already married himself.
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