Looking at the reactions surrounding Bob's disappearance, I've noticed this;
Mrs Harrod didn't change much. Obviously, there was the shock and grief, but she was an approachable lady before Bob's disappearance, happy to have her wedding in the news, and she has remained media-friendly to this day.
Eldest daughter PB seemed to use the internet a bit, but otherwise kept quite a low profile. She seems to be doing about the same today. Not much change.
Middle daughter RB seemed to use the internet a quite a bit, and have a strong interest in history and heritage, and a willingness to be actively involved in those things. She hasn't changed much either, I think. She kept a kind of middle profile?
Grandson seemed to have a somewhat obscure life, built around finances and achievements and businesses and houses that seemed somehow elusive, fading away when focused upon. He didn't appear to change much either.
The housekeeper seemed to work hard, in a responsible way, and speak out when she thought she needed to - that still fits now, I'd say.
The hairdresser seemed very sociable, and happy to accept gifts. I don't think that's changed.
Son in law seems to have had a very low public profile, and it's even lower now. So he's changed a bit.
And youngest daughter JuM. She had the biggest public profile of all. From publicity about kidney donations, to dogs and arts and crafts and complaints about overbuilding. I bet there is more too. Maybe amateur theatre stuff? For the first three days after Bob's disappearance she was out there doing what she had always done - stepping into the spotlight; talking fluently and freely to media. Never lost for words except for those few seconds before the 'maybe one, noon' answer.
After that, she shut down. Shunned the media, and still does, to this day. Totally out of character, and far too early for it to be blamed on cyber-stalking, etc.
JuM stands above all others close to this case to me, in her obvious, drastic change of behaviour after Bob disappeared. There has to be a reason for that, and I think everything else sort of fades into background noise for me. I keep trying to work out what it could be that made her reaction so different from her sisters', and the only reason I keep coming up with, is that she is married to the last known person to have seen Bob.