I posted this on another thread. There are tax consequences involved. When you die and they sell their cost basis on their interest will be at your original purchase price, or maybe on the cost value at time of putting them on the title. (not sure how your cost basis will be treated, not familiar with joint ownership). The cost basis on your share may be stepped up. If they inherit everything the cost basis is stepped up to the cost on the date of death.
It's the same as inheriting your house. You may have paid 35,000 dollars for it years ago and when you sell it for say 700,000 dollars you will pay capital gains on 165,000 dollars (IE 700,000 - 500,000 - 35,000 = 165,000. assuming jointly owned by you and spouse.)
When they inherit the house the cost basis is stepped up to assessed value at time of death.(IE stepped up value is now 700,000.00 - 700,000.00 = 0 taxable value.
Plus if you want to sell in the future you all have to be in agreement (assume if they are underage you may be able to act in their behalf.)
Check with your tax advisor and attorney, I have been wrong before.