I'm thinking about canceling at the last minute for my weekly visit to my cousins. My cousin is sick, but I really want to go on a date with this guy I've been crushing on.
Have you asked her if she is sick, is that the main reason you would cancel?
I want to date this guy. It's the only opportunity I have.
It is not nice to cancel when someone is sick. They may need your help.
I'll go eventually when my cousin is better but I have to make this date.
If this guy is decent, then he'll understand that you need to spend time with your family. If you already made plans to spend time with your cousin, then canceling at the last minute will be inconvenient for him.