Hazeld - you should each leave your own children your half of the estate, so your children are entitled to 25% each of the total estate, and his child is entitled to 50%. You might not think that fair and the children might agree with you but unless you can remove the possibility of your children or his child receiving nothing at all, this is the way to protect them. Imagine the scenario where you slit by three, so that your two children end with 66% of the estate and his 33%, and then you die, your hubby might make another will and completely cut out your two children to enable everything to go to his child. Of course, the same can be said if he were to die first. It's easier to say that you know neither of you would disinherit the other's child/children but how do you know for sure?