Large gifts given to others are taxable. There are some loopholes. For example, a parent can give up to $10,000 per year to a child without incurring gift taxes. But if you have income that can be classified as ‘carried interest’, then you can give huge gifts to your children without incurring any tax whatsoever.
Romney’s tax returns reveal that he gave $100 million to his children using this loophole, that is available only to the wealthy whose income is from investments.