Did you get them from a breeder or a pet store?
If pet store the mother could have had recessive trait for albinism, in addition to who ever the father of your spawn was.
Multiple males can fertilize a spawn, usually the spawning male will chase out any intruders, but if you watch your tank all the fish are excited, and I have seen other species try to rush in to the spawns.
So she could have spawned with multiple males, of which one was either an albino or carried the albino gene, and she has to have an albino gene also.
There are albino EY's, though doubtful of the purity, and there are also pet stores that sell EY's that look like EY's but are of mixed parents.
Nevertheless, in order for her to have albino's, she also must carry the trait.
This is not an absolute rule however.
Anybody who raises albino bristlenose plecos knows they don't follow the rules.
Albino bristlnose pairs can have normal colored fry, and that should not happen according to the rules.