I'd opt for the division of assets to be between the three children. But it's not about what other people think; remember that this should be your decision. A Will is about the wishes of the person writing it. It's my understanding that in the UK, other than rules ensuring the financial security of bereaved spouses, young children, and (in certain special cases) "dependent" adult children, you can divide up your assets exactly as you choose to. So do what you want to do!
My garden has been ruined by ????


