What does connubial fidelity mean?

loyalty: loyalty to an allegiance, promise, or vow sexual faithfulness: faithfulness to a sexual partner, especially a husband or wifefactual accuracy: accuracy in reporting facts or details

acting in a professionally responsible manner

Treatment fidelity has to do with how accurately or faithfully a program (or intervention) is reproduced from a manual, protocol or model.

Faithfulness

Connubial means marriage. So inside of using harsh words in a argument as a "missle" to launch make and forth, his sister and her husband somewhat threw Pip at each other.