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Upon reaching 4th level, and at every even-numbered sorcerer level after that (6th, 8th, and so on), a sorcerer can choose to learn a new spell in place of one she already knows. In effect, the sorcerer loses the old spell in exchange for the new one. The new spell's level must be the same as that of the spell being exchanged. A sorcerer may swap only a single spell at any given level, and must choose whether or not to swap the spell at the same time that she gains new spells known for the level.
At 3rd level, and every two levels thereafter, a sorcerer learns an additional spell, derived from her bloodline. These spells are in addition to the number of spells given on Table: Sorcerer Spells Known. These spells cannot be exchanged for different spells at higher levels.
I think this is fairly clear for a straight sorcerer--you cannot swap your bloodline spells (and that makes sense)... but what about a Crossblooded sorcerer (see below)?
Bonus Spells: A crossblooded sorcerer may select her bonus spells from either of her bloodlines. The sorcerer also has the choice to learn a lower-level bonus spell she did not choose in place of the higher-level bonus spell she would normally gain. Lower-level bonus spells learned this way always use the spell level that they would be if the sorcerer had learned them with the appropriate bonus spell.
Example: A 3rd-level aberrant/abyssal crossblooded sorcerer has the choice of learning cause fear or enlarge person as her bloodline bonus spell. If she selected cause fear as her 3rd-level bonus spell, at 5th level she could use her new bonus spell to learn enlarge person instead of bull's strength or see invisibility, and she would add it to her list of 1st-level spells known (just as if she had learned it as her 3rd-level bonus spell).
Emphasis mine.
Clearly in a home game one can ask the DM "Will you let me swap (at an even level) one of my bloodline spells for the same level spell of the other bloodline?" I want to know if this is something that was intended with Crossblooded, because RAW, it doesn't seem legal (and thus isn't legal for PFS).
