The post-synodal apostolic exhortation Amoris Laetitia of the Pope Francis received much criticism, many of them included in in the letter Correctio filialis de haeresibus propagatis. In this article, we focus only on the questions, which arise in connection to possible ethical interpretations of some of the exhortation's passages. The subject of our interest is hence the question, whether, with this document, situation ethics has been, not only permitted within the Catholic teaching but rather affirmed as one of its pillars? This is linked to the question, whether the situation ethics, as outlined by its author, J. Fletcher, can be Christian ethic in a first place; and respectively, under what preconditions it may become Christian ethic? The article offers some answers to these questions, especially within the context of a so-called trilateral Christian situation ethics, which emphasizes the relationship with the other through God. We argue that the Holy Scripture includes grounds for sufficient arguments, which validate this kind of ethical appraisal.