Ninety-days prior to the expiration of the card, you must both file a joint I-751 Removal of Conditions Application with USCIS to establish that you have a bona fide marriage. Evidence to establish that the marriage was real and not for immigration purposes include but is not limited to:
Evidence of cohabitation, such as copies of lease agreements showing that you and your spouse lived in the same place;
Copies of documents proving that that you and your spouse owned property together;
Proof of joint assets, joint bank accounts, joint insurances, joint loans, etc
Photographs of you and your spouse together and with family and friends throughout the course of your relationship
Proof of travel together (hotel reservations, flight confirmations)
Proof of continuous communication (emails, text messages, phone records)
Copies of birth certificates of your children
If the marriage has dissolved within the two years, but was bona fide when you entered the marriage, there are waivers to the joint filing of the I-751 application. Reasoning for a waiver to the joint I-751 filing include: