The other character that's mentioned in the poem is the boy's father, whose trees they are, the property owner, who also is absent.

这首诗里提到的其他人是他的爸爸，这些树就是他爸爸的，这些财产的拥有者，但也没有出现。

耶鲁公开课 - 现代诗歌课程节选

It disappears and comes back, and at that time his mother, who is actually Freud's daughter, was going out to work for the first time on some days, and the boy was getting used to letting her go.

它又消失了之后又出现了，在那时他的妈妈，实际上是弗洛伊德的女儿，正准备,第一次出去工作一段时间，男孩正慢慢习惯,让她出去。

耶鲁公开课 - 1945年后的美国小说课程节选