Hello,

I thought that I had Multibit classic, but after reading all posts, I am not sure anymore. I tried to copy the layout of my Multibit via Snipping tool in this post, but I didn't manage... Sorry about this. However, it seems that with Multibit HD seems more common to recover bitcoin, so I hope this is what I have.

Lucius: No, can't find the may who helped us back in 2014 to set up the wallet and told us to keep those 16 words. It was a 'one day event' that you book through meeting website for events with people of similar interest. This one was for novice people willing to have help to get a wallet with Multibit.
I can however, remember very well that he said that those 16 words were to be kept in case we had to recover the wallet and those words in we loose it, we was like loosing our bitcoin and we needed them to recover the bitcoin if needed.

NeuroticFish: It flash each word in orange and offers me an alternative word instead. How weird. I could understand if I written badly one word (because of one wrong letter) but it does that for each of them... I tried to replace with the alternative suggested for few words, but it keep going on. So I got back to my initial words (the way I wrote them) ignoring words suggested to see.
Then I went to the Derivation Path section and selected 'Multibit HB' in client: I have in orange top of the page the message: 'Invalid Root Key'.

Thank you again for your time and help. I really appreciate also your patience...

Nicky