Three Brothers and a Mayor

I've had these three chaps a while now... they came in a set and I can see why - two of them are distinctly brothers - even though the centre photograph is different from the other two and maybe taken somewhere else, the facial features are different - but what about the fella on the right? His picture was obviously taken in the same time and place as the one on the left, at least, and yet he looks completely different... unfortunately unless relatives are traced we'll probably never know who they were, or why so serious...

But the different, centre photo reveals a clue - I'm afraid I'm no dab hand at deciphering vintage handwriting, but here I've done my best:

Taken at South

Shore - ** Sep ***

1909 -

I was staying at the Brighton, with C + W*****

As far as I can find out, South Shore is in Massachusetts, but as for the Brighton - if that's what it says - I can find nothing. Please, if you have a better suggestion of what this says, leave a comment!

This guy, however, who I found inside a book as I recall at Sherborne tip, is from considerably later - the only clue to his identity being the words: "Michael Mayor 1977/78" written on the back. How ironic would this be if that was actually his name? Please - if you recognise him, leave a comment, and we might be able to reunite this photo with his family or office.