Is atrial fibrillation inherited?

Sometimes: There is a gene that makes the tendency to get it more likely, but most a fib is due to environmental and aquired factors such as age, valvular heart disease and alcohol.

Rarely: If atrial fibrillation is inherited, it is most often because of some other associated condition which is also inherited. There are rare types of atrial fibrillation which can be inherited, but generally speaking it follows either aging or other disease processes.