How would you evaluate this behavior? Serious or not?

My son in law, 40, appears to be the perfect husband, father and son. Great job; helps cheerfully with the kids 7 and 3, is warm and inviting, great attitude and non-argumentative, fun loving “people person”, fantastic wife. They’re all a joy to be around. But he will sometimes get up in the morning, refuse breakfast then have a beer around ten a.m. His happy wife doesn’t mind but he went thru a 12 pack in 24 hours with the help of his wife. Is this a bad sign or the norm?