User blog comment:Ncduru/Who is Anna?/@comment-27337151-20151203103824

The post which states that Anna might be related to Lucy's family seems logical. Zeref knew Layla so it means Anna might have a connection. Also, Brandish has some feud with Lucy and her mother so it suggests that Anna is related to Brandish as well.

Maybe Anna is Layla's sister. This makes Brandish and Lucy cousin sisters.