How does Maya's relationship with Bailey change over the course of I Know Why the Caged Bird Sings?

It is clear that for most of the novel, the relationship
that Maya and Bailey have as brother and sister is a very close one that is very
important to Maya. This is particularly evident in their childhood relationship, as they
would often conspire together to do things they knew they shouldn't. For example, their
closeness is seen in the way that they worked together to trick Momma so that one of
them could hear the gossip when the Reverend Thomas came to
call:

We had
a system that never failed. I would sit in the big rocking chair by the stove and rock
occasionally and stamp my feet. I changed voices, now soft and girlish, then a little
deeper like Baily's. Meanwhile, he would creep back into the Store. Many times he came
flying back to sit on the bed and to hold the open lesson book just before Mommma
suddenly filled the
doorway.

Their closeness is
shown in the way that they conspire together and have fun together, and by the amount of
time that they spend playing together.

However, as they
both grow up, Maya is forced to concede that things change and people develop. Although
Bailey remains incredibly important to her, the beginning of Chapter 33 makes it clear
that during her absence when she went to spend some time with their father, Bailey has
changed:

readability="8">

Bailey was much older too. Even years older than
I had become. He had made friends during that youth-shattering summer with a group of
slick street boys... Although I had no regrets, I told myself sadly that growing up was
not the painless process one would have thought it to
be.

This sense of division
only widens as Bailey struggles with his feelings of love and attraction for their
mother, which finally ends in his leaving both Maya and his mother. Thus, although Maya
and Bailey are incredibly close throughout the novel, as they grow up and age, they are
shown to grow apart, slowly but surely.