A Crossblooded Bloodrager selects two bloodlines at character creation and opts to forego his choice between either bloodline's 1st level power and instead gains a bloodline familiar.
Those with an inherent connection to magic often attract creatures who feel a similar instinctive pull toward magical forces. At 1st level, a sorcerer, bloodrager, or any other character with one of the following bloodlines can choose to gain a bloodline familiar. The character gains a familiar (as a wizard's familiar), treating her class level as her wizard level for the purposes of this ability. This familiar has an additional ability listed below based on the master's bloodline.
This replaces the 1st-level bloodline power granted by the character's bloodline; in addition, the character gains bonus spells from her bloodline one level later than she normally would. For example, a sorcerer with the aberrant bloodline who takes a bloodline familiar would not gain the acidic ray bloodline power, and she would gain her first bonus spell at 4th level, her second bonus spell at 6th level, and so on.
GMs may use the following bloodline familiar abilities as written, or employ them as guidelines for devising bloodline familiar abilities for bloodlines not listed below.
Emphasis mine. Assume, just as an example, that this character chose the Arcane and Draconic bloodlines.
The Arcane ability is Spell Catalyst (Su):
Spells you cast that target your familiar are treated as having a caster level 2 levels higher than your actual caster level.
The Draconic ability is Dragon's Flight (Ex):
The familiar can sprout draconic wings, granting it a fly speed of 30 feet with average maneuverability for a number of minutes per day equal to 1/2 your caster level (minimum 1). These minutes need not be consecutive, but they must be spent in 1-minute increments. At 10th level, the familiar's fly speed increases to 60 feet with good maneuverability. At 20th level, the familiar's fly speed increases to 90 feet.
My question is this: Which additional ability does the familiar have?
Best Answer
You gain both as options, then you pick one of the two
The Crossblooded Rager
Bloodline Familiar as you quoted:
The Bloodline Familiar replaces both 1st level Bloodline Powers on the two lists, but the Crossblooded Rager chooses one of the two options from both lists. At level 1 he picks one of the Bloodline Familiar powers, and then at level 4 he could choose one of his 4th level Bloodline Powers or the other 1st level Bloodline Familiar power from his other bloodline.