Is this even a mystery, she is called 'choti Anupama' for a reason. Anupama left Vanraj only for EMA otherwise Vanraj was and is achcha beta, pita and insaan for him. Now Toshu is Jr Vanraj, so till he does EMA things will stay as it is.
Lets not bring yourself, even in such hypothetical, fictional characters. Any sane person, will not fall in love with Toshu otherwise after marriage there have been so many incidence to show her, her mistake.
Toshu did character assassinated his own mother; first in Shah House (fine Kinjal was not there) but then in Anu's house. If she wanted to leave or had any sense, she would have left him by then. It was right in front of her eyes, how cheap, disgusting and narrow minded his thinking was. If not for a baby, what is the guarantee this guy will not question Kinjal's character if she was stuck with male colleague for a night.
After finding out too she didnt leave him
It's just that family found out about the affair or else it might have never come out
It took her for hom to say that you & Anuj were together last for her to move from shah house.
And no ,he is not a good father. someone who teaches kids to ridicule their mom is not a good father.He never cared for Samar coz he supported Anu.
At best he is just a good son. Not even a good brother to Dolly
6