I won't say it is ridiculous, they are taking the situation as it came. One fine day some random incident happened which panicked Teni and she barged into Parth and Shorvori's house.. Parth and Shorvori had no option but to let her stay with them. Had Teni not got that misunderstanding, she wouldn't have come to Bhanushali house, neither Parth or Shorvori would have thought of doing that.. Ofcourse, Teni can't stay with the family for the whole 9 months, because for them she is unmarried sister of Shorvori. Later or sooner they will realize that and will have to make alternate arrangements.
What is bothering me is the precap! Dadaji saying that Teni ki bidai from the house will happen only as a bride.. Lets see how the trio handles this situation.