The prophecy in 17:11-14 refers to Solomon, David's son. But, aspects of the prophecy will be fulfilled by Jesus. So, here it is best to translate the words "father" and "son" with your normal words for a biological father and son.
# I will not take my covenant faithfulness away from him, as I took it from Saul
The abstract noun "faithfulness" can be translated as "faithfully." AT: "I will never stop faithfully loving him, as I stopped loving Saul" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])