Is it okay for me to say no to my mom?

Anonymous
I'm 25 about to be 26 in couple months. I live about 20 min away from my parents house. I been spending way too much money and trying to stay home. I'm getting annoyed at my mom because for the past 4 weeks on Saturdays my mom has been asking me to go to the house to watch my dad while she goes to the store with my sister. She can easily go by herself while my sister can watch my dad since my sis lives with them! But my mom can't do anything by herself. I'm tired of it the worse was last week my mom made me waste my gas to take her to police station (she getting worse mentally) and she wanted to report that hospital lied about my dad getting cancer. Which is not true he did have cancer and it shows. Point is im tired of this because I go every sundays and feel she's doing this on purpose its almost as if I live there now. I want to say no but my mom manipulates everything and makes me feel guilty. She will also lie and say I don't love my dad. I just can't stand how she can't do this on Sundays. I want to be away from my mom. It's making me want to die because I feel like I can't live my fuckin life! She gets mad if I say no if I have my own plans for the day like leave me alone already I dont want things to become a regular thing
Is it okay for me to say no to my mom?
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