Unless an offence is duly registered as against a person police has no right to take cognizance of the same, unless the charges pressed are of cognizable nature. Now, you having submitted that the girl has issued two notices informing you to lodge complaint u/s 498-A, this can be used as a defence that the act was deliberate and premiditated and the complaint was lodged with malafide intentions to harass the husband and his family members at the time of evidence. Reason being, no girl would send a notice informing her intentions to lodge fir u/s 498-A as against husband and his family members. The girl would rather act forthwith by lodging fir and getting action initiated as against the delinquient.
If the complaint which was lodged by the girl has already been recorded asNon-cognizable u/s 155 of Cr P C, fresh report if any filed, cannot be taken into count if the same is on the same context and allegations levelled in the first report/complaint.
Sure, your lawyer can procure the copy of NC and the copy of report lodged by the girl. he will have to apply for certified copy of the same with the concerned police station.
The validity of the satement is evaluated by the court at the time of evidence when the complainant has to enter into witness box and pursuant to the same when the complainant is cross-examined. It is after recording the deposition of the complainant by way of examination-in-chief and cross examination, the validity or veracity of the statement is judged on the basis of corroboration, omissions, suggestions and new story coming into picture which was never stated by the complainant.
Your parents sure can visit India, there is no problem about it. If the complaint is registered and FIR is drawn in such event you can move Court of Sessions for grant of anticipatory bail. You can seek services of a Lawyer who can appoint some person to keep a watch if FIR is registered as against your family members. Likewise, once an FIR is registered within 24 hrs the copy of same is to be sent to Magistrate within whose jurisdiction the police station falls. So you can always have an eye on the fir which are in court and if the same is lodged, you can get a copy from court and proceed for seeking anticipatory bail.
Hope this clarifies your querry. In case you need any further guidance, feel free to communicate.