Vivek, Dev, Vaishali and Dadi knew Vikram. Mrin was unaware of him. He sure is related to PB. I think He is 2nd son of Purohit who was trouble maker and was kicked out of the house.
The precap showing Vishaka and Vikram walking to each other does indicate their romantic involvment. But Vishakha does not have Sindoor or Mangal Shutra. So if she is pregnant, the child cannot be Raj Purohit. I like this new story line.
I love seeing Dev Rad's romance but family start up is next step...