My definition of Ethos is a skill necessary for persuasion. It is often described as "character" a type of skill worthy of respect that uses grammar to get to a point.
My definition of Logos is using logic on a scenario and using evidence to back it up. Making a claim and also using Reasoning
My definition of Pathos is Persuasive skill that is often used to appeal to the audiences emotions. Grammar and different word choices can also be used to improve this skill.
Heinrich used the "stern father" act on his son showing his character as method or way trying to persuade his son to do something that the son doesn't like.
Heinrich used Logic to prove his point to his son about how wearing long pants was just reasonably better than shorts under the weather.
Heinrich uses a Pathos Example of the time his son was trying to wear shorts rather than long pants. He used the example of his son's legs getting chaped to appeal to his emotions in order to persuade him.