Firstly, I very much doubt they'll even ask about the previous interview. As it's a panel, I'm guessing it's quite a large company, they likely get many people who apply for many jobs there before finding the 'right' role and accepting.

If they do ask, simply explain that you felt the previous role wasn't the correct decision for you and your family, and you wouldn't want to start in a role and then find that X months down the line you can't continue with it. They'll understand this, and they'll understand the benefit to both them and you in not previously wasting time starting a role you couldn't of stuck with. It's far better to train up someone who's planning to stuck around for the 'long haul' rather than someone who comes in, and quickly is off looking to move to another role again.

Firstly, I very much doubt they'll even ask about the previous interview. As it's a panel, I'm guessing it's quite a large company, they likely get many people who apply for many jobs there before finding the 'right' role and accepting.

If they do ask, simply explain that you felt the previous role wasn't the correct decision for you and your family, and you wouldn't want to start in a role and then find that X months down the line you can't continue with it. They'll understand this, and they'll understand the benefit to both them and you in not previously wasting time starting a role you couldn't have stuck with. It's far better to train up someone who's planning to stick around for the 'long haul' rather than someone who comes in, and quickly is off looking to move to another role again.