Saraswati was staying in her own house, till Yuvraj fiasco happened and all of Garodia FMLY moved into Sarwaswati's house..and then the Gaordia's got back their house, they asked Saraswati to stay with them for some time as Durga was going to get married.
And when Saraswati decided to go back to her house after her mother would come back from some Holy Place, before that Bhavishya already made her fmly believe that she has a mental problem, thus her family did not wanted her to go away from them as Kshitj does not have a family (Mother/Father).
Where as for Durga, she was in her house till Bhavishya faked that she is missing and when the fmly landed in his house they found Durga unconcious, and Bhavishya faked again that he will leave his job and be beside Durga all the time, that's when Garodia fmly asked them to move in with them till Durga recovers as Bhavishya's parents do not stay in Rajpipla..
Hope that is clarifies