Link/share memory maker with friend traveling w/ us on separate reservation?

I just purchased memory maker. We have a friend there for a few days during our trip, staying at a different resort on his own reservation. He will be with us most of the time so we will have lots of mm photos of all of us together, but is there a way to link my mm purchase to his MDE for his own ride photos etc…?

As far as I know, you just have to have him on your friends and family list to be able to share MM.