Drunk dad charged with dropping 5-year-old son (Omaha, Nebraska)

UNNAMED DAD. Notice that there is NO mention of a mother, just a (paternal?) grandmother. Where is Mom? Why is Daddy lurching around drunk in heavy traffic with this boy?

 http://www.omaha.com/article/20120803/NEWS/120809958/0

Drunk dad charged after dropping son
Omaha police said officers saw a man carrying his 5-year-old son down the middle of South 24th Street during a time of heavy traffic.
The 28-year-old man, officers said, was believed to be highly intoxicated.

According to a police report, officers saw the man drop his child as he fell down in the street at least twice about 4:30 p.m. Monday.
Police officers said the father had cuts on his forehead and a bloody nose from falling.

He was charged with negligent minor care, a misdemeanor.
The boy was not injured and was released into the custody of his grandmother, police said. — Sam Womack