Do they have any connection to their Punjabi side?

So I found out a couple years ago Amitabh is half sikh! Why does he look like he's totally from the Hindi heartland, did his Mother not have as much influence on him as his Dad? He has great command on Hindi and sounds so sofisticated when he speaks, does he even know Punjabi? At this point I feel like due to Jaya he probably has a greater Bengali influence too. Why doesn't he talk about his Punjabi side? Also, I always thought Ajay Devgn was Marathi, and he looks like one too. I've never heard him speak in Punjabi either like I hear Akshay Kumar! Has his family lived in Bombay for way too long and now lost touch?