what is a line of rulers that passes power from father to son

It could be a hereditary monarchy or a dynasty.

It can also be primogeniture if the power and lands pass to the oldest son.

Please not #2 below which is taken from an online dictioary.

Main Entry: pri·mo·gen·i·ture
Function: noun
Pronunciation: -"chur, -ch&r, -"tyur, -"tur
Etymology: Late Latin primogenitura, from Latin primus + genitura birth, from genitus, past participle of gignere
1 : the state of being the firstborn of the children of the same parents
2 : an exclusive right of inheritance belonging to the eldest son

To identify a line of rulers that passes power from father to son, you can use the following steps:

1. Determine if the rulership is based on hereditary succession: In many cases, power is passed down from a ruler to their biological or adopted children. This is known as hereditary succession.

2. Look for the term "dynasty": A line of rulers that maintains power within a family is often referred to as a dynasty. This term specifically suggests a hereditary system of rulership.

3. Check for the concept of primogeniture: Primogeniture is a specific form of hereditary succession where power and lands pass to the oldest son. This practice is commonly associated with European monarchies.

4. Consider other factors: While a line of rulers passing power from father to son is often associated with hereditary monarchies or dynasties, there can be exceptions. Some systems may allow for succession through other family members or even non-related individuals.

5. Conduct further research: Depending on the specific context or historical period you are referring to, it may be helpful to delve into the unique customs and traditions of that region or time period to gain a better understanding of how power is transferred.

Remember, these steps are a general guide, and there may be variations or different practices in different cultures and historical periods.