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By Mary Snow, CNN

We continue to learn more details about the Connecticut school gunman, Adam Lanza, and his mother. But there are few details about his father, Peter Lanza.

Peter Lanza's home is less than one hour away from where his son, Adam, opened fire in Sandy Hook Elementary School. But a person who knows him says he hadn't had any communication with his son in about two years, when Adam cut his father out of his life, about the time the elder Lanza remarried.

Until then, Peter Lanza, an executive with GE, had weekly visits with Adam, according to the same source who said Lanza hadn't lived in the Newtown house since 2001, eight years before his divorce with ex-wife Nancy was finalized.

In the hours after the shooting, a reporter for the Stamford Advocate who was outside Peter Lanza's house, told CNN's Wolf Blitzer that Lanza was apparently unaware of his son's involvement in the shooting.

"I said, you know, we received a report that somebody at this address is connected to the shooting in Newtown and his face just went from, you know, he'd been this very polite stranger who was making pleasantries with me and he went from that to sort of shock and this horrified look and, you know, essentially declined comment, rolled up his window and went inside his house," said reporter Maggie Gordon.

Since then, he released a statement expressing condolences for victims' families and friends, adding "we are in a state of disbelief and trying to find whatever answers we can. We too are asking why."

Peter Lanza's sister-in-law told reporters both Lanza and his ex-wife were committed to their kids' welfare.

"They were the type of parents even when they were married as well as being separated, if the kids had a need they would definitely fill it," said Marsha Lanza.

Court documents show few hints of an acrimonious divorce and indicate a comfortable lifestyle.

Irreconcilable differences were cited as the reason for the divorce, finalized when Adam was 17.

Alimony was set for this year at $289,000.

Those documents also show Peter Lanza would pay for his son's college and graduate school, medical insurance, and provide a car for him.

CNN has learned Nancy Lanza was not home for at least two-and-a-half days before the shooting.

She checked into a hotel in New Hampshire.

Friends say she often took mini-vacations leaving her son, Adam, alone in the house.

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