Punar Vivaah is comes with a very unique concept where they show the bonding between them who have no blood relationship. In other serial we see that female lead try to make bonding but here yash bonding with ansh to make him happy, confident and secure feeling infront of his father.
Ansh so much devotted to his father and believe that he never loose any race if his father with him. Even yash want to keep ansh happ by winning the race- even his mother forcedfully stopher and he think that aarti ji never want any relationship with him But he fullfill his duty as father towards his son.
Now when aarti connect with yash daughter, she also perform her duty as well and shower her love to them.
Whenever i see such chemistry, I think strong bonding never need any blood connection between the two individiuals.