my dad is the same, a simple fellow who just goes with the flow to keep a quiet life! he said to me "you know what shes like" before he cut me down and told me i had to get on with my life. shes spent a lifetime keeping things from him and he utterly stands by her. the more i downed my mum the further he went away from me and listened to my mums poisen about what a bad preson i am and how i am the one who resents her. she was using my protests against me to him. my advice, dont diss your mum in front of your dad, just tell him to respect how you feel like you respect him, and leave it at that. in my opinion, like my dad,yours is just a victim too, its unlikley he will see the light now if he hasnt done already.