If my dad or mom also divorced and I was young i'd also have complicated feelings for the situation, is not easy to see your parent as "another person with flaws" specially when we are young. The dad is a nice guy but still, if I remember correctly he also doesn't talk much about it, thats why they are still on bad terms. Now that Kirara is a friend of the dad's lover maybe Ken is thinking about actually turn around the situation with his dad and talk to him, he can't be like that forever.
If my dad or mom also divorced and I was young i'd also have complicated feelings for the situation, is not easy to see your parent as "another person with flaws" specially when we are young. The dad is a nice guy but still, if I remember correctly he also doesn't talk much about it, thats why they are still on bad terms.
Now that Kirara is a friend of the dad's lover maybe Ken is thinking about actually turn around the situation with his dad and talk to him, he can't be like that forever.