Final answer:
The data element of the patient's father in this case is a social element, as it pertains to the familial relationship of the patient.
Step-by-step explanation:
The data element of the patient's father in this case is a social element, as it pertains to the familial relationship of the patient. It is not a mathematical, historical, or scientific element. It falls within the subject of Health, as it involves the understanding of family dynamics and relationships in the context of healthcare.