Sid brought Sana's parents in between.
He should know that his mom has literally done a lot for him. Someone who is a replica of Shuklas nature wouldn't have tolerated him. There are many parents who leave their kids to be on their own and vice vers.
Not all are good.
Maa Baap Bhagwan nahi hote, koi to Shaitan ke roop Lethe hain.
One is for all and all is for one does not hold good for every one.
Sana may flip, only she knows but today Sid has hurt her where it pained the most.