This is what I read about it:
Quote:
Neville was very sad about his parents, and visited them in the hospital, although they could not recognise him, he was also "quite proud" to be their son as he told Harry Potter in 1995. Augusta Longbottom, Frank's mother, was also very sad. She too had a high opinion of them and was very proud when her grandson fought in several battles, like his parents, she even stated that he was finally starting to "live up to his father at last."
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It doesn't mention what else happened but I guess it's safe to assume that they never recovered.