Trump would probably attend hillarys if invited because he is simply a good person. He won’t be invited to Bush’s and the media will try to blame it on Trump in some way.
The real fight will be over who delivers a eulogy Bill or Hillary. Hillary could start her presidential bid right there and then.
Haven't heard the plans, even though it should be a "State Funeral". I wouldn't put it pass the family to go private like they did for Barbara's he can change his mind on such things, it wouldn't surprise me at all.