I need advice about my naturalization?

hey im a permanent resident and was just about to become a naturalized citizen but when i went to the interview it said that my mom, my sister, and i had a deportation on 1995. Right now im 22, at that time i was only 6, now i've asked about my problem to immigation officers and everyone has said that being a minor that does not go into my record. In 1997 my parents put in my sister's and my paper's, including my mom's, and in 2000 my sister and i where able to become residents and my mom was deported and was sent to mexico. On 2004 i had to renew my residence card, but what i don't understand is that if i was able to become a resident and was able to renew my residence card how come 16 years later this happens to me. my sister did the same process last year and she was able to become citizen, but nothing was found in her file. Now Both of us must give a pardon contact a lawyer and go to court to ask forgiveness to something that does not go with us. can someone help me? thank you