I guess Sinha is trying to show that all the kids in the modern generation are thankless towards their parents...
Aastha - spurred Simran when she found out that her mother was Neha and took shelter in Kiran who was the complete opposite of Simran. Also, looking beautiful and becoming a model is the new goal of somebody who was studying towards becoming a doctor!!
Sia - forgave her dying mother when she realized that she was not adopted but kidnapped as a child...but there was no sense of loss that she felt on losing the woman who took care ofher for all those years when she found her real 'mama'
Yash - cared only about Kiran and Anil to get money from them...and decided that biological fatherhood is the necessary and sufficient condition to be providing him a lifestyle!! Basically, eventhough he is at least 20-21 years old, he doesnt feel tht he is old enough to support himself!!!
So, it seems that the current generation is simply materialistic and thankless. It is really funky what they show in the serial. By the way, if Yash lived in the US, and is less than 21 years of age, he could not have gotten a tattoo without the presence of an adult with him...hmm!