We have found a relative who emigrated to Canada from England in 1904. Both parents and two siblings died before 1921. There were three girls left. We have trawled through all the records we have access to and also newspapers but can find no trace of them. One of their brothers who died we believe was adopted.Could you point me in the right direction in trying to find these three young girls?

If the children were minors when their last parent died there may be court records.  While adoptions were possible in that era they were still rare and mostly private.

 

It's also possible the children were placed with living relations - did anyone else emigrate or is it possible they could they have returned to England?

 

Later this year the 1921 Canadian census will be transferred to Library & Archives Canada, once they release it for public viewing it may provide a few more clues.