How well do you get on with your Mum ? if you are close share what you have learnt about sikhi with her , maybe show her sikh websites/channels you follow , tell how you feel about sikhi , I'm sure she'll understand you are not going through a phase and support you. It might not be her cup of tea but she should be able to empathise wanting to be a better sikh (most women are spiritually inspired very few are not) . Get her on board first , then tackle dad ... Of course if you get on better with Dad go the other way around , most people want their kids to be good humans so I really cannot see them being so hard on you . Keep on touch ... stay in Chardi Kala