The inference that sir ector had taken care of arthur from infancy I supported by the fact that

This inference is supported by the fact that Arthur refers to Sir Ector as "my dear father" and has for him the admiration and love that a son has for his father.

Explanation:

Hi. You did not show the text this question refers to, but after researching this question on the internet and understanding the context of the question, we can assume that it refers to the book "Le Morte d'Arthur" written by Thomas Malory. This book tells the story of King Arthur from childhood to death.

During his childhood, Arthur was raised by the knight known as Sir Ector, who treated him like a biological son until the day he managed to pull the Scalibur sword out of the rock. Arhtur sees Sir Ector as a father and this is evident when he refers to Sir Ector as "my dear father."

be more specific with your question.