How should one expect to feel around the holiday time? Is it appropriate to use rituals that you used to do with the deceased?
Being sad and lonely around holiday time is very common. It is a reminder that things have changed. It is also a loss of the shared experience you had with your parent. Nonetheless, making the day special can be very helpful! Some people develop rituals; for instance, on your dad's birthday, some people will celebrate his life, or do things like having a special Christmas ornament from him each year.