I travelled to the US with my mum when I was 6 we overstayed and returned to my native country when I was 13. I recently applied for a tourist visa with my husband and concealed information about my overstay in the US in the past. I told the consular officer that I have not visited the US. I figured this information wouldn't be important because I was a minor when I was there and did not want to complicate it as I was not previously told reasons of our departure He denied my application based on 212 (a) (6)(I) misinterpretation. My question is, is this a permanent ban? What steps can I take to rectify this situation and reapply? And will it affect my husband and kids? My husband visits the US often.
I think you meant 212(a)(6)(C)(i), at which concerns misrepresentation (not misinterpretation), codified at 8 USC 1182(a)(6)(C)(i):
Any alien who, by fraud or willfully misrepresenting a material fact, seeks to procure (or has sought to procure or has procured) a visa, other documentation, or admission into the United States or other benefit provided under this chapter is inadmissible.
The inadmissibility is not limited in time, but there is a waiver available. The application fee is high (currently $930), and the fee is lost if the application is unsuccessful.
You are unlikely to overcome this without professional legal help. You should try to find an immigration lawyer who has experience helping clients with misrepresentation bans.
And will it affect my husband and kids? My husband visits the US often.
Nobody can answer definitively if it will. It should not. The policy manual does not state nor imply anywhere a person becomes inadmissible or should their visa be denied because a spouse committed an immigration offense. Although married you are two different adults and your applications will be evaluated separately.
Unfortunately however consular officers are human beings with wide latitude to approve or deny nonimmigrant visa applications without appeal and your misrepresentation could prejudice him against your husband.