I seriously doubt that this will get made - I saw it earlier today whilst looking up what was in review for todays announcement. It's not bad, but not particularly striking or inventive (sun protection theme notwithstanding).
Lego may well say something along the lines of "Thanks for sharing the inspiration behind this submission, it's a lovely thought and we'll bear that in mind when reviewing." but ultimately, that could just mean that they're going to be careful in how they reject it, to avoid negative publicity.
They could give fun at the beach and a few other sets with a beach theme (campervan and anything with a surf board or beach in the name) to the family instead to show that they care. Plus that might actually get to them before the father dies, which I think is important.
I hope the son isn't pinning all his hopes on getting this made. It's a very sad situation for him and his family as it is.