Before Prerna went to jail before the leap, the only 2 things that she handed over to Anurag was to take care of their biological kids, i.e., Prem's samadhi, and to take care of sneha as Anurag was the only one who knew Sneha was the actual killer. With great confidence he said his usual dialogues 'tum chintha mat karo prerna' and blah blah. Then wat happened?!?!
Prem's samadhi was destroyed by prem, and sneha went into drugs and ruined her life. And very nicely he flew with sam to london and was enjoying their marital life! What responsibility of a father did he fulfil? Ok forget about taking care of bajaj and his family, atleast he could have given proper love and affection to sneha after bajaj left them and went na, so that she never went into drugs! If kids are taken care of properly and strictly, never will they go into drugs. He was the only one who knew wat sneha was going through after prerna left. She was before itself mentally depressed, after the accidental murder by her, anurag should have taken extra care of her. But he dint do so and even after seeing her personality change, he dint do anything about it! He was busy romancing sam with their bedroom doors open! Just imagine if sneha would have seen that scene, how would she have felt?!
The only one good thing he did as a father after this was to give love, hug and emotional support to prem when he needed it the most, inspte of him having destroyed prerna's family! Like how someone said, true love is to love a person when he least deserves it!
But overall i think anurag couldnt become a good father, inspite of nature having given him a 2nd chance to be a good father after bajaj left sneha and went. This was the time she needed his love and support the most, and he was not there for her!
How can we blame prerna for blasting him after she learned that prem broke prem1's samadi?!