im so pissed, tomorrow is my little sisters bday and all she asked from me is to take her to visit…

im so pissed, tomorrow is my little sisters bday and all she asked from me is to take her to visit my dad since.Saturdays are the only days kids can go, (he's incarcerated) so since my moms all against me and what not she decided to not let her go... seriously? She has nothing to do with our situation. my poor sister and my dad won't be able to see each other for her birthday all because she wants to act like a child.. that pisses me off .