There is an Alanon group in my area that is a book meeting and uses the AA Big Book. However, you can only find out about this group by word of mouth from other "renegade" Alanoners. The local Alanon office does not list this meeting and won't even tell you about it. I had called and inquired and was told in no uncertain terms that "the AA Big Book is NOT conference-approved literature" and that thus no group using that could be an approved Alanon group or be listed on the web site.
I went a few times and it seemed like a decent meeting, but I've not been back since due to schedule conflicts.
I've done some reading in the Big Book myself and found it somewhat helpful, but for now, I've got other things that seem more pertinent and useful to me right at this point.