The BLRW got crossed on GLW right from the start...the first thing Mr. Barber did when he imported them was cross them on GLW from Duane Urch. So unless you are importing them from Germany they are probably going to have GLW crossed in them from way back when...and dont let any breeder try to BS you about birds bought at an estate sale that were imported from Canada...that is also an old rumor from 20 years ago.