We are only two daughters for our parents. My father is completing 60 years this birthday.

Hi, We are only two daughters for our parents. My father is completing 60 years this birthday. As daughters we want to do sashtiapthapoorthi for him. My father does poonal changes during avani avattam religiously but does not do santhya vanthanam as a daily practice due to work. Because he had not been doing Santhya Vandanam daily, can we not arrange sashtiaptha poorthi for him?? What does the shastra say?? Please clarify. Please advise. Padma