My sons wife problem

Hello,

If FIR is registered then arrest in the above offence is possible so apply for anticipatory bail. Later on fight out the case on the basis of proof you are having. 

It is always proper to contact a local advocate and take precautions well in advance.  Identify such a competent advocate and entrust the case to him.

Since it is only a complaint filed by your DIL, where SHO can not arrest either of you in the given facts.

Wait for registration of FIR and apply for anticipatory bail.

There is no need to rush for anticipatory bail. The police are under strict instructions not to make arrest in such cases except with the express approval of the SP of the District.