Is it normal to have this kind of relationship with your mother?

He's there. My Dad is phenomenal. He's a fantastic father-figure and I love him to no end - but he doesn't really do much about the situation (though that's not really his fault). Monday through Friday he's at work and on the weekends, things usually go better since he's there. My mother doesn't feel "comfortable" saying the things she usually says when he's around. I know I should probably tell him but I wasn't really sure if it was a big enough deal to be considered an actual "issue". I feel like it is, but then again, it could've just been me.