Who is You Are April Day on Earth written for?

Who is Lin's "You are April Day on Earth" addressed to? There are two versions, as follows:

1 is for Xu Zhimo, and this poem is a love poem written in memory of Xu Zhimo. Lin is a woman who has been in love with Xu Zhimo all her life, and her love made Xu Zhimo a poet.

This is a letter written by Lin to her eldest son, Liang Congjie, expressing her incomparable love for her children and the hope and vitality she saw in her son.

It is impossible to verify it now, because it is too difficult and the significance is not particularly great.