We’ve covered all of this on the other thread, I believe.
Shared gifts if not possible buying for all, or smaller gifts per child. If absolutely necessary for only biological children to be gifted, don’t make the SC watch. Do it a different day.
Otherwise, you’re trying to exclude them - and I can’t fathom why.
Wills - I have no input. With most I know it would be out of the norm for any GC to inherit, it goes to their parents and then they decide whether to “share,” personally I would. Same goes for any inheritance from other, non parental, family members - it would have benefited my whole family and not just myself, or any biological children.
Otherwise, again, it’s intentionally excluding. Unless someone said “Do not give any of that to your SC,” and if that was said - I’d have questions.