It is VERY difficult isn't it? I agree with you mare that the boy with the light coloured trousers in the photo of when they were younger is the youngest.
By jove I think I've got it! Thanks to Nick. Yes, I do believe the following of the first group photo I sent through:
L to R (or another way of looking at it)
Youngest to oldestMan 1 = youngest Youngest = Man standing left )
Man 2 = 2nd eldest 4th eldest = Man standing right )
Man 3 = eldest 3rd eldest = Man seated right ) Same as Nick
Man 4 = 2nd youngest 2nd eldest = Man seated left )
Man 5 = 3rd eldest Eldest = Man in the middle )
So.................. this now means that Man
2 IS the man in the photo of the man on his own!!!!!!!

Now with all this in mind, I with "attack" the photo of the boys when they were younger & see what I come up with there.
Thank you all for your help. It really does help to have others to discuss these things with. I'm a happy little chicky now

Bye for now,
Michelle