This was really good as far as it went. I was really enjoying the action and the split in the narrative into two parallel scenarios.
An idea occurred to me that it might have been a great way of Jake (with his twisted mentality) deciding that it was a way of just trying to get his family back together.
He sees his dad's leaving as due to his mum not being the woman his dad wanted, and so he takes it upon himself to 'break' or reprogram his mother so that he can say to his dad - "Come back home now, dad. I guarantee mom will be the wife you always wanted. So we can be a family again."