But one gray morning Brother and Sister didn’t get along well at all! Maybe it was the weather---or maybe it was because the mockingbird slept late. But whatever it was. Brother and Sister Bear got into a big fight…
不管是由于什么原因，小熊哥哥和小熊妹妹大吵了起来……
请问我的翻译对吗？
我认为意思是对的，只是译文比较生硬，需要再改改。
修改了一下：
But one gray morning Brother and Sister didn’t get along well at all! Maybe it was the weather---or maybe it was because the mockingbird slept late. But whatever it was. Brother and Sister Bear got into a big fight…
不管是什么原因引起的，总之小熊哥哥和小熊妹妹大吵了起来……
还是生硬，全文连起来，你大声读一下吧。
管他为什么呢，反正兄妹俩大吵了一架……
咔咔……
管它怎么回事呢，反正兄妹俩吵了一大架。