Question

c. The day your younger brother or sister was born
You could write about:
how you felt when your mother went to the hospital
how you felt when you heard that you had become an elder brother or sister​

Answer 1

how you felt when your mother went to the hospital:- I felt very happy , since I will get a brother/ sister.

how you felt when you heard that you had become an elder brother or sister:- If I hear, she is a girl then I would be happy, since I am too a girl. If he is a boy, then ok, he will protect me from others. Thus, boy/girl, doesn't matters.