My theory is that Randy is a ~65/35 mix of Robbie and Dougie, or rather Robbie is 65% and Dougie is 35% of Randy's personality since he's older . Like Dougie and Robbie, he is a thug, but a thug with a criminal record due to mommy and daddy not being able to cover up his activities. I'm sure this has and is an asset for the Fords.
Doug's fealty to Diane to more than a dutiful son would show to their mom, I think it has a lot to do with his inheritance and access to the trust Diane controls. And yes it is true, we all make poor choices, it's all how we move on from them and hopefully we see them as a learning experience.
I accept your apology? I was making a joke, and evidently not a too convincing one, so all's well. Being obsessed is something I can easily understand, especially about matters like the "Fords", the poster family for all things devious.