Dad charged with selling heroin while holding 8-month-old daughter (Central Islip, New York)

Dad is identified as TYREEK LANGS, but what happened to the baby's mother? She has been erased from the story. Why is the baby now in the custody of the (father's?) great grandmother?

http://www.longisland.com/news/06-15-13/crime-report-father-sells-heroin-while-holding-8-month-old-checkpoint-leads-to-12-arrests.html

Crime Report: Father Sells Heroin While Holding 8-Month-Old

Crime, Local News By Eric Anderson Published: June 15 2013

Police said that they arrested a man on Thursday for selling heroin in Central Islip. According to a press release, Tyreek Langs was holding his 8-month-old baby as he sold heroin to a waiting buyer.

Fourth Squad detectives along with officers from the Crime Control Section were conducting surveillance at the time of the incident.

Officials said that they watched Langs exit his home at 45 Peters Blvd. with his daughter in his arms around 3 p.m. He walked to the corner of Peters Boulevard and Kelly Avenue, and sold and unspecified amount of heroin to a buyer.

Police immediately arrested Langs, they did not say how much heroin the 23-year-old had on him at the time. Langs was held at the 4th precinct and was scheduled for arraignment on Friday.

He is facing charges including Criminal Sale of a Controlled Substance in the 3rd Degree, Criminal Possession of a Controlled Substance in the 7th Degree, and Endangering the Welfare of a Child.

Child Protective Services were notified, and Langs' daughter was released into the custody of her great grandmother.