Well I do know that watever Pranay told Shruthi was wrong, and he shouldnt have spoken this way to his own mom in front of everyone!
But, Shruti deserves this cos wat she did to her own mom, she is just getting it back from her son! Each and everything that she has ever told parvathi, and hurted her, pranay is saying the same thing to shruthi!
Now once he realises that Shruti is not his own mom, and then watever she will have to listen from him will again compensate for the times shruti taunted parvathi of not being her 'original' mom. Infact when parvathi was accused of killing om, very conveniently she came to court and said infront of them that 'she is not my original mom', that day when parvathi needed her support the most, she became the main reason for her tears and destruction!
Only now she will realise how much it hurts when ur own child refuses to take u as a mother, and questions ur love for all these years, and blames u for being a horrible mother! It is very important for shruti to realise this, then only she will understand exactly what parvathi went through for all these years and, and wat she is going through now!