MERRY CHRISTMAS EVERYONE!

Ok so I may be worrying about nothing but here's the deal.

My cousin was hanging out with a friend on Monday. They shared a drink. Friend wakes up with a stomach virus Tuesday morning. Cousin has no symptoms and it's been 48 hours. Cousin is coming over today for Christmas.

Am I at risk or am I just worrying about nothing?

They are young kids (4 or so) if that makes a difference. The only one coming is the one who didn't get sick but shared a drink with someone 24 hours before they became ill.