As very often happens, Dad's custodial rights are not spelled out here. Whether he had full custody, joint custody, visitation or something else is not clear. But he had some kind of access. And how much you want to bet that he had a history of violence that the courts ignored when he was awarded access?
Dad is identified as KEVIN LOCK.
http://wsau.com/news/articles/2015/nov/16/father-charged-with-child-abuse-in-waukesha-county/
Father charged with child abuse in Waukesha County
Monday, November 16, 2015 4:28 p.m.
TOWN OF EAGLE, WI (WTAQ) - The father of two teenage boys is charged with two counts of physical abuse.
The mother of the 15-year-old boy called the sheriff's department after receiving a picture message from her son of fresh bruising while he was at her ex-husband's house November 9th.
42-year-old Kevin Jock was charged in Waukesha County Circuit Court on November 10th.
The boy’s 17-year-old brother also had neck injuries and bruising, and told Emergency Services that he did not feel safe in his home when his father was there.
If convicted, Jock could face up to 7 years in prison and $20,000 in fines.