Hello there! Welcome to the Forum, first of all, enjoy yourself here 😊 Secondly, getting to your question, as you already figured out, he is Sagar's bro. Jhanvi aka Ganga married Shekhar so that Sagar would marry Kaveri. Yup, she is very close to Shekhar's daughter Gudiya. But she did NOT marry him. Just when she was about to marry him, somebody shot Shekhar and he died. Now, she is simple faking that she is Shekhar's widow so that Sagar would marry Kaveri and that she would not come in between their marriage later.
PS: Now that I've answered your question, here's a simple request: Please post all of your questions/queries in the helpdesk. It will make the section stay clean as usual 😳
-Navi 😃