My SD is 16 and I've been married to DH for 2 years. At the start she was hostile to me and wanted nothing to do with me. Now, although she does not like me much she copies me in every way. She is becoming me. The small face expressions, gestures, talking with my hands, tone, phrases I frequently use, she is changing rapidly and becoming me. It's not just mirroring me, it is literally everything. It is like she is studying me and turning into me.