If you want property to go to your children and not to your new spouse's family, then you need to be very specific about your intentions. Generally there are five basic problems which should be addressed in replanning and organizing your estate. Whether or not this feeling is deserved, it is something that should be addressed as quickly as possible. Otherwise, the underlying tensions in a family may create messy legal battles down the road. If there is an eventual dispute about an inheritance, it's a rare family that has as much harmony and good will after parents die as before.
Good communication is very important.
You can be specific about explaining and setting up a plan that is equitable , but not always equal, while you're still alive. It's much harder to properly unravel the reasons behind complicated distributions through a will or trust after death. To provide the most control of assets and their eventual ownership, it's often better to distribute proceeds during your lifetime. Then, there's no question about your intentions. Prenuptial agreements are necessary if you want to preserve your assets for the original family.