Why does Vasu misunderstand Sadhana's goodness

Even though Sadhana has proved time and again how sincere she is towards Alekh and his family Vasu doesnot really understand her goodness and sincerity. Alekh has made a huge improvement since his marriage with Sadi. Vasu being a mother should never overlook how important Sadhana is in her sons life and how much recovery he has made because of her. I dont understand why she is so unsecure about Sadhana stealing away her two boys when she is the one making positive differences in their lives Why does Vasu feel threatned by Sadhana when all she has done in the past is good and not let any harm come towards her family. What say guys?

When ur bad u think the whole world is like that Vasu has always used people as per her own convinience so she thinks even Sadhna is the same that is so mean of her and the whole family is narrow minded cheapsters!!

Except Alkeh and also may be Ranvir!!
Alekh is the most understandable sensible and adorable one, i find Ranvir Adorable too but i hope he doesnt disappoint by having "Similar" Samajdhari type thinking like his family members!!

Luv,

Shagun