Welcome DuvanMuvan, Your Mum sounds very "Spiritually Weak" (still thinking) to have married a non-JW and to give you so much latitude. You are very lucky.
I wonder if your Mum is just trying to placate her JW parents and/or family. Is your Mum baptized?
If you don't want to be a JW, just ask your Mum to help prove WTBTS doctrine that you are having trouble with using the Bible. Ask lots of questions of your Mum in an innocent way using information from www.jwfacts.com and/or asking for help from JWN members, and don't talk until your mother answers the last question asked. If you want to learn more about how to talk with a person who has been indoctrinated by BITE control techniques, please watch the following video: Strategic Interactive Approach explained 2003 (1:23:23)
Peace be with you and everyone, who you love,
Robert