Convey to Thanks

I live with my family, so I always meet my parents. However, I cannot convey my thanks to parents especially Father. As you know, my faminy consists of five people: four are women and the only one is man. So Father may feel small... However, Father thinks our sisters' and works so hard, I feel them a lot. But I cannot say thank you for him honestly. Can you say your feeling for your father honestly? My father's birthday is July 31, so I am thinking that I will present for him and to convey my feeling ;-) Do you have any advaice??