Background

I don't know if this is where I post something like this...so apologies in advance if this is in the wrong place. 

I haven't been watching Pavitra Rishta for very long, but I'm a huge fan. And I've just read the character descriptions under 'Cast'. It says that Savita Tai is Manav's stepmother and Sachin and Vandita his step-brother and step-sister. I didn't know that! I've never noticed anything that indicates this. So I was wondering if that particular detail was planned but never executed ie. the creatives decided to leave that out and make Manav Savita Tai's biological son. Or have I missed this completely in what I've watched so far? But I could almost swear that Savita Tai has used the line "I carried you for 9 months...".

So yes. Just wondering :)