Slightly different scenario but....
A number of my fb friends have DC with autism. My son is autistic.
A number of my fb friends have parents with dementia or Alzheimer's. My mother has Alzheimer's.
Almost without exception, these friends post frequently about their disabled relative, often recounting details of strange, embarassing or distressing things they have done.
I never post about my son or my mother, have never even mentioned their diagnosis on social media although anyone who knows me reasonably well in person is aware. I just don't think it's fair and an invasion of their privacy. My son is high functioning so I don't think he would appreciate reading it in the future (doesn't seem to stop friends with high functioning kids though). I have a number of relatives who are close to my mother on fb and who I update privately - I think it's unfair to plaster it all over fb!
I do feel a bit bad though. I have one friend who posts prolificly about his mother with Alzheimer's and gets loads of comments supporting and empathising. I never comment but we do discuss our mothers when we meet in person.
When I do post on Facebook, it tends to be be positive stuff - pics of days or nights out, holidays, good stuff that has happened (not filtered though). It probably gives the impression that my life it's much better than it really is.
Does this make me a fake by commission??