@Byron, you need to get your children involved in whatever it is you are passing down to them if you wish to create intergenerational wealth. They can't just get it when you die, they have to have inputted some blood, sweat and tears into establishing that wealth. If you do that then it stands a better chance of succeeding than just gifting them $5million of assets when you cark it.
We are talking substantial wealth here, not just inheriting the family home or the holiday home but building a family business. Real estate would play a huge part of that plan, say using your SMSF to purchase a commercial premise from which you and your wife run a business. Your children may be a part of that business, or if the property lends itself, then they may rent some office space or a shopfront from you and operate their own business from the property.
So the first thing you need to do byron (if you haven't already done so) is become self-employed. Then you employ your kids or they get jobs that teach them skills that one day can be used to be self-employed and contribute to the family firm.