Analysis of Which Is The Favourite?

Brothers and sisters I have many:
Though I know there is not any
Of them but I love, yet I
Will just name them all; and try
If there be one a little more
Loved by me than all the rest.
Yes; I do think, that I love best
My brother Henry, because he
Has always been most fond of me.
Yet, to be sure, there's Isabel;
I think I love her quite as well.
And, I assure you, little Ann,
No brother nor no sister can
Be more dear to me than she.
Only I must say, Emily,
Being the eldest, it's right her
To all the rest I should prefer.
Yet after all I've said, suppose
My greatest favourite should be Rose.
No, John and Paul are both more dear
To me than Rose, that's always here,
While they are half the year at school;
And yet that neither is no rule.
I've named them all, there's only seven;
I find my love to all so even,
To every sister, every brother,
I love not one more than another.