Answer:
$10,000
Step-by-step explanation:
Gifts are only taxed when their fair market value is higher than $15,000. Any gifts made to your spouse are not taxable. Gift taxes are calculated on a per person base, as long as they do not exceed the lifetime exemption (which is $11.58 million).
The tuition costs of her niece are not taxable since they are less than $12,000. The stocks given to his wife are not taxable either. The only taxable gift is the land given to his sister which had a FMV of $25,000. The taxable amount = $25,000 - $15,000 = $10,000