bypass icloud activation

I have an iphone 5 that is on activation mood, it is orginally belonging to my cosine who passed away last three months, his sister wanted to use it so we restored it, the thing is that the phone is ios 9.0.2 now, on activation mood, and we dont know the password, we only know the email. I tried many ways to delete the icloud account, but nothing work, does anyone knows how to do so?