Dear Querist
My opinion on your queries are as under:-
1.. Can I go for annulment of marriage because she was pregnant during the marriage? The family also cheated us for money.
Opinion:- there is no procedure/law in India law related to Muslim husband,regarding the annulment of marriage, you may pronounce divorce her as per islamic law.
2. If an annulment is not allowed in Muslim marriage law. Can I file any other way to void this cheating marriage?
Opinion:- As above, apart from the above noted divorce you may also file a cheating case against them before the magistrate court or before the police.
3. Can I file any cases on their family due for their cheating?
opinion:- as ABOVE
She has given false police complaints but due to strong pieces of evidence from my side, the police were not ready to file FIR.
Opinion:- it will be better to take action against her immediately otherwise once her complaint has been registered then your complaint will have be weak than her and can be consider as counterblast.
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