Annie I just can't imagine a scenario where a married couple, both MPs, would have such political differences that they would feel that they both had something so different to offer their party that they would have to stand against each other. Not talking about standing for election to the golf club committee or neighbourhood watch here, but a major political party.
Can you imagine Hillary Clinton standing against against Bill - it just wouldn't happen!
Of course David Miliband had no right to inherit the party leadership, but I found it quite extraordinary that his brother, older or younger it makes no difference, to whom he was close, stood against him.