The only heirarchy that might be involved in most family photos would be traditional. From this photo I see the man on the end - he is not young nor old - he has his hand on the older lady who is sitting - his mother? The next man is about the same age as the lady - who is holding his arm - her husband? So I see son, mother, and father. Now for the tricky part - the two ladies on the end. Usually, couples who are married like to be posed together not apart. But if the couple are engaged or not yet married, they may not feel comfortable together. Now the lady on the very end is about the right age to be either a sister, a wife, or even a mother-in-law. The lady next to her is also old enough to be a sister or wife, but not quite MIL yet. She is holding onto the arm of the lady next to her - in style with a daughter holding her mother. The hard part is deciding if they are mother and daughter, and which is the wife? Is the young man about to marry the lady on the end and she has a daughter from previous marriage - or is the young man about to marry the lady who is posing along with her mother? One last area - this could also be the whole family - brother, parents, and two sisters.