No, actually, Anna's looking so similar to Josh's sisters is NOT coincidental.
Bill Gothard, the founder of IBLP, had strict guidelines about what females in each age group and station in life should look like. He had " ideal girls" and " ideal young mothers" and so forth in his sicko perverted mind, then in his literature and indoctrinations for the young teens who were interns at his office headquarters. They never changed, no matter the year or styles.
I know them so well from www.RecoveringGrace.com, which is a gathering place for HIS personal survivors of abuse, that I can quote them, but I will not give the sick0 g0at the recognition.
Just remember, if you see people like the Duggars, they were once earnest believers of the lies spouted by Bill Gothard. SOME of the 2nd and 3rd generations are breaking away to form healthy lives and relationships, but not nearly enough.