Manjari is mother of none

I feel manjari cant concieve. Harsh wanted a heir for his family. Manjari adopted abhi as her son as she can't concievr thats why abhi was older when he saw harsh's behaviour with manjari. 

 Harsh had an affair with some one else and thought of leaving manjari but unfortunately while giving birth mother dies and harsh blames neil to be responsible for it. 

But only confusion why harsh loves abhi so much unless he is his kid or just because he is good doctor so he want to use him for his PR