Thank you all for your responses,
Yes I'm married, I was thinking to send some letters from a couple of friends/family members saying something like:
I am X, I've known Z for W years, I've also met K (my wife) and they are awesome together (well... something along those lines

)
Or would including those would be too much? I'm indecisive.
We have included some photos with eachother friends/family, memoirs, etc. So this would be a 'plus' in terms of evidence