Wife’s family pressured registration—what can I legally do?

Our marriage took place at the house of my wife’s brother-in-law (Jijaji). I was informed that her ex-husband could pose a threat to our safety, which is why her family didn't reveal her parental home or invite any relatives to the wedding. After marriage, they pressured me to register the marriage immediately, especially her Jijaji, who acted aggressively and unreasonably. Later, I discovered that my wife was still in touch with him. When I questioned her, she shouted and called him to tell him what happened. A few days later, she went to her parental home and switched off her phone. When I went there, her Jijaji verbally abused both me and my mother and said that without marriage registration, our marriage was not valid. My wife witnessed everything but stayed silent. What legal actions can I take in this situation?