This is a copy and paste, but does answer your question correctly under English law
If you leave a gift to a residuary beneficiary who dies before you, the gift will be re-directed by your Will as follows:
* To any children the beneficiary has, in equal shares.
* If the beneficiary has no children, then proportionately (�pari passu�) to the other remaining residuary beneficiaries.
* If none of the above applies, the residuary estate will go to any alternate beneficiaries that have been named, in the percentages you specify.
* If any of the alternate beneficiaries die, their gift will go to their children, or if they have none, proportionately to the other residuary beneficiaries.
* If no alternates are named, or they are all dead with no children, the residuary estate will be given to a charity of your executor's choice.