Though someone has passed away, it does not mean the memory of him dies. One way to remember the person is by celebrating his birthday. This doesn't have to be a large, extravagant party, but just a small thing you (or your family) do every year to remember this person. It's just a token to show that the person was important to you and to thank them for making an imprint on your life.
Start a tradition to take flowers to the person's grave every year on his birthday. Purchase his favorite flowers or a balloon to place on the gravestone.
Prepare a meal for your family consisting of his favorite food. Go around the table and share a happy memory. Complete the meal with a birthday cake or an extra dessert treat he loved.
Gather a small group of family and friends and share an activity on his birthday. For example, if he loved baseball, attend a game or make a picnic lunch at a park with a baseball diamond.
Hold a charity event, and donate the proceeds to his favorite charity. For example, hold a bake sale at your local church or school.