I found this topic via googleing “Al-anon with an emphasis on Adult Children". In my country Estonia there is aca and al anon separate groups but in my travels to germany and to norway i have been in al anon/aac mtgs.
I know bit historical matters of schism in al anon ie why those two groups splitted.
And i have read both materials and i can say that both groups are important but about those together i can not say much.
For me those two are separate groups enough ppl in groups can be same when it is small place...