They state that although it mutates, when H2H, that it doesn't indicate that it will be easier for people to catch it. Well, it did make it easier for several people to catch it.
And as far as it causing more severe illness, the only more severe it could get is it if killed people before they catch it!
While it apparently made the disease easier to catch, it still did not make it 'easy', as far as we know.
I believe there was one survivor in that cluster, so the kill rate was not 100%, but those are definitely poor odds of survival.
WHO: Bird flu spread among family members
"The experts were expected to discuss the large family cluster during the session. One of the remaining mysteries is why only blood relatives - not spouses - became infected.
"The WHO report theorizes the family shared a "common genetic predisposition to infection with H5N1 virus with severe and fatal outcomes." However, there is no evidence to support that."