What exactly do you mean by “like your cousin?”  While family members are often the most difficult people for us to like, they are also often the most rewarding relationships to have.  If you don’t like your cousin, keep it to yourself so that you don’t cause more familial strife than is necessary.

If by “like your cousin,” you mean have romantic feelings towards your cousin, that is a different story.

You can’t help how you feel.  The feelings themselves are not wrong.  What you do with those feelings, however, can be wrong.  Consummating a relationship with your cousin can cause any number of problems.  You could end up with a child with special needs, uncontrollable feelings of regret, familial animosity, etc.  None of these problems are worth the moments of ecstasy your cousin may provide you.

If you are not planning on consummating your relationship with your cousin, why worry about whether or not you like your cousin?  Innocent feelings, when not acted upon, are harmless.  Find someone else to like if you need to reduce the amount of temptation.  I know you’ll say, “but I can’t help who I like,” and while that is partially true, the more you try to like something, the more you end up liking it.  For example, I had a friend with a summer job with a 45 minute commute every day.  He hated country music at the beginning of the summer, but after listening to it (as it was the only option on the radio) for an hour and a half every day, he started liking country music.

Ultimately, it is not wrong to like your cousin.  Just be careful what you do with those feelings!