Regarding evidence

My sister and her husband is living separately since last 8 years and divorce petition and restitution of conjugal rights case of in high court. We got to know that my sister husband married another girl and took her into abroad. We field a case under these sections 409-A, 341, 406 and 494 r/w 34 IPC. To prove his second marriage we don't have marriage certificate / photos / wedding card only we have is his second wife passport copy and VISA copy these documents are given by his company where he is working. Now my question is can court consider the passport and VISA copy as evidence for his second marriage. in passport his name was not there but VISA his name is there but no where mentioned word wife/husband on VISA. We filed a DV case as well and though of to use these documents in that case as well. How much these documents (passport of second wife and VISA copy) helpful. your answer is greatly appreciated.