A natural home remedy for getting rid of and preventing Grey hair is Warm Coconut oil and Lemon Juice.
Apply some warm coconut oil and lemon juice mixture onto your hair and make sure you get the coconut oil and lemon juice into your scalp and hair really good and leave it there for 30 minutes and then after 30 minutes has passed you can wash it out of your hair with water and then wash your hair again with shampoo.
To get rid of and prevent Grey hair you need to do the above procedure twice per week for this to be effective.