Answer:
$208,000
Step-by-step explanation:
For 50 years of marriage, Barry and Mary accumulated over $3.5million.
They have 3 children and 5 grandchildren which gives a total of 8.
You are allowed to give up $13,000 each year to a person without incurring tax liability.
This means Barry and Mary can give $13,000 to anyone each
For the 3 children and 5 grandchildren, Barry and Mary can gift $(13000 * 8) each
= $104,000 each
Therefore, Barry and Mary can gift $208,000 (104,000*2) to their children in 2017 without gift tax liability