I'll cut 41 slack due to his infirmities. Dubya started his descent to oblivion by going full lame duck during his last two years in office.
Always have liked GW, he is a good man, and a loyal brother, the Donald put the screws to Jeb pretty good, and in the end GW tried to help Jeb, but it was too late.
I think family loyalty, and the fact that if they neither endorse or condemn Trump, they only lead to speculation about their true feelings.
The only thing they are doing is NOT tipping their hand.
I can live with that all day long.
I think the both Bushes began their decline with their failure to stop the murder of Terri Schiavo. Either one of them could have saved her, had innocent human life been more important to them than their own careers. And I think had either of them they shown the moral courage to do so, with the clear support of the other, Jeb would be the respected and beloved nominee and President.