There are some serious drawbacks to many options for giving gifts to grandchildren. Either there are no tax or estate planning advantages, or you have no control of the funds (or lose control after a certain point), or the money could affect a grandchild’s eligibility for financial aid. An option that overcomes many of these problems involves transferring money into a trust established to benefit a grandchild. You can express your wishes about when the income and principal will be available to the grandchild, and even how the funds will be spent.
Transferring funds into such a trust offers the following benefits: 
(1) You can reduce the size of your estate by transferring up to $17,000 (in 2023) into each trust you create for each grandchild. No gift taxes will be due in connection with the transfers;
(2) Although the trust owns the assets, you control them as trustee and can decide what type of investments to make;
(3) Income earned by the trust from amounts that you’ve deposited will not be taxed to you; the trust pays the taxes;
(4) Amounts deposited in trust, and the income earned from those funds, will be used for the benefit of your grandchildren; and
(5) You can provide that the trust terminate at any age you specify.
In order to qualify for these benefits, however, certain restrictions apply. These trusts are complex legal documents and should not be set up without the help of an experienced attorney. As a result, the chief downside of such trusts is the cost of establishing and maintaining them.
Finally, you must be totally comfortable with this gift-planning strategy and the amount of money available to you in your estate. In short, you should only make gifts if you feel certain that the amount of funds remaining in your name and the amount of income they will produce will be adequate for your needs.