Well, actually it's not. When they found Shorwari's body it wasn't recognisable. By law to declare a person legally dead one need to get postmortem and other tests done to confirm the same. This wasn't done in this case, even police wasn't inform which is illegal in itself.
Secondly as there wasn't any evidence of Shorwari's death, one need to wait 7 years before getting married again. Parth hardly waited 3 months. This is illegal again.
Third, suppose, you are right, and this marriage with Teni is legal, then, his first marriage needs to be nullifies in case Shorwari is found alive, as per Hindu marriage act, under no circumstances a man can legally keep two wives at the same time.
If you want i can give you atleast 10 examples where this show has not followed law properly. And 10 examples where medical science was ignored. Legally Parth and Teni can't go out as husband and wife abroad and apply for visa as partners if Shorwari's name is added on Parth's passport. Legally Parth cannot put Teni's name in admission form for his kid. Legally Teni cannot be Ipshita's mother. Legally Teni cannot use Parth's name in any official document as it will be a fraud. So..as u are saying nothing is illegal, u r totally wrong. Even Shaurvari's operation track was in a way not as per medical procedures.
Talking about Gharwali baharwali, both the wives weren't aware at first of all this, and only in the end they both met the hero togthr, This is a crap too and I never enjoy such terrible movies. It's 2018 and we have better movies to watch where women are empowered. We are now producing movies where women are entrepreneurs and independent not just a baby producing machine, that era was in 90s. Even then I find movies like Arth more reasonable as women are shown as individuals in them. There are many movies which glorify gangsters, do that mean we will support gansters? No. I am glad it's changing.
Talking about the impact of the show on the society, the problem is they are showing surrogacy in a very bad light. Many ppl are still skeptical about it and they are afraid of all this. This show could have shown it in a positive light, but it failed miserably.