《宋书·志·卷十五》
父亲在世立子为嗣，当可以说是合乎情分和礼制。 
父在立子，允称情典。 
When the father was alive, he established his son as the heir, it can be said to be in line with reason and ritual system.
<s>[INST] 将以下英文转换为文言文: When the father was alive, he established his son as the heir, it can be said to be in line with reason and ritual system. [/INST] 父在立子，允称情典。 </s>
将以下英文转换为文言文: When the father was alive, he established his son as the heir, it can be said to be in line with reason and ritual system.
user
父在立子，允称情典。
assistant