That's normal.. I fought with my own mum too many times in the end she gave in.. She gave in because she has seen what kind of grandson she has few years ago.. Spoilt brat, ill manner to her, rude.. All because of how she has give in to my son too much and spoilt brat him. I tried to change my son this 2 yrs plus and my mum see the change attitude in his grandson and finally accept how we have to teach children. It's a way long journey as old folks mind set is stuck, in the end I have to use my child as an experiment to show her that her education system dosent work in this gen.