Annie This is why the ending bothered me. It just kind of seemed rushed and adding this detail seemed like an attempt to wrap up any loose ends with him in a way that involved the least amount of work.
This answer contains spoilers… (view spoiler)[I think his being married helps the prosecution -- the police -- paint Rachel / Rowan as a bad character. Instead of being inside with the girls, she's left them alone in the house to have an affair with Jack. Of course, Rachel doesn't know he's married, and she's only next door with a baby monitor, she hasn't really abandoned them for the night. But when on trial, the prosecution would definitely use the fact that Jack was married to make Rachel seem like a deceptive person. His being married also explains the fact why he never visited her in prison. (hide spoiler)]
This answer contains spoilers… (view spoiler)[I respectfully disagree with Katelyn. I'm pretty sure it says the police used her time with Jack as another possible motive so they must know about it. I think the point is throughout the book the nanny thinks Jack has a secret so in the end it turns out he has one but not one that has any relevance to the case. (hide spoiler)]
Dale Rosenberg I think it's intended to resolve Rowan/Rachel's suspicion of him. She has the impression he's hiding something from her. There's a red herring of his name being the same as the man whose daughter died. Every time she thinks he might be part of what's happening to her, she feels like it makes no sense but keeps coming back to feeling like he is hiding something. So this explains what he's hiding.
Carol I agree 100%. When we have to think this much over something seemingly irrelevant reading the book becomes a chore.
This answer contains spoilers… (view spoiler)[I thought Jack said he had been working there for several years, I don't recall if it was ever said if he was a local. Jack is in this remote area while the wife and child are in Edinburgh. The server at the coffee shop knew him and gave Rowan a look that went away when Jack said she was the new nanny not a lady friend. Jack was inviting her to hang out on the weekends so maybe he didn't want to badmouth his employer since he was thinking of cheating with the nanny too. Rowan also mentions Jack's hands several times so he didn't wear a wedding ring or have a mark from a ring. (hide spoiler)]
This answer contains spoilers… (view spoiler)[It's a good excuse for Jack not to show Rowan/Rachel any support after she's arrested. I definitely think she told the police all about Jack, who then got questioned, and whose wife probably found out about the liaison. The wife (Lynn? Remember when he mumbled something to "Lynn" as Rowan was leaving? At least she thinks that's what he said) probably keeps tight reins on him after all of this, and knowing he's married helps Rowan understand why he disappears on her. (hide spoiler)]
Brandi I think Ware added that fact at the end to encourage the reader to believe that Jack was behind the strange occurrences that were happening in the house. Jack being married, to me, didn't really mean anything towards the story.....almost like an afterthought....like "by the way, Jack's married"