At any time ... And the thoughts of amendments should be considered throughout the lifecycle ... Sh.it happens and the weather changes!

aadetoyin: funny enough this has never crossed my mind. i feel it depends on your kind of family and the kind of family that your spouse comes from. if they are the type that will come racing for their brother's property then one should start preparing a will immediately you start acquring assets and you can keep amending the will when your assets increase. if not, just wait till your children are teenagers and let them know about every property that you own because no one is to be trusted.

Will is very important immediately you start acquiring property.
You cannot trust your own siblings until issue arise.
Extended family member can be funny and unreasonable sometimes.