My dad actually had similar problem in the past. I think it is very much to do with our Asian upbringing. My mother taught my dad how to show affection to his kids. My mom told him that he couldn't replicate my grandparents' parenting style and told him what to do.
Thankfully, he was willing to learn and my mother learned a lot from the western style of parenting too. I think the willingness to be open to new thing and lesson is very important in this case. Never too old to learn :)
Thank you for sharing this valuable lesson, love!