Fir order by magistrate for cheating case,

son & duagher witness can be accepted by court. Independent witness is more effective.  Examination of complainant - A magistrate taking cognizance of an offence on complaint shall, examine upon oath the complainant and witnesses present, if any and the substance of such examination shall be reduced into writing and shall be signed by the complainant and witnesses and also by the magistrate.

It is not necessary to get an independent witness deposed for taking cognizance of the complaint.

As per your concerned query!

Under section 154(3) of Cr.PC any person aggrieved by a refusal on the part of an officer in charge of a police station to record the information referred to in subsection (1) may send the substance of such information, in writing and by post, to the Superintendent of Police concerned who, if satisfied that such information discloses the commission of a cognizable offence, shall either investigate the case himself or direct an investigation to be made by any police officer subordinate to him, in the manner provided by this Code, and such officer shall have all the powers of an officer in charge of the police station about that offence.

As per your provided information, if the Superintendent of police lodged your FIR, you don't need to file a complaint under section 200 of Cr. PC before the magistrate.

Independent witness is required where no independent person agrees to become a witness, there is no reason to doubt the version of police and recoveries made pursuant to the disclosure statement of the accused. The need to examine independent witnesses in such a case is only a rule of caution evolved by the judiciary to prevent the misuse of provision of section 27 of the Evidence Act.

Hope it clarifies the issues!
Regards
Minakshi Bindhani

Having lodged the FIR, it is for the Police to take further steps.  Being a cognizable offence, onus for producing the evidence is primarily with the police and the prosecutor.