Let's look at it this way...

                      In part one of Wide Sargasso Sea we are informed of Bertha Mason’s (Antoinette) disabled brother. I mention this fact because I believe it is a huge factor to Antoinette’s character development. We also see her mother slipping into the stages of becoming mad. Antoinette also gets her clothes stolen by a little girl (this I found hilarious) .It is also seen that Antoinette prefers to be alone. Nearing the end of part 1 a fire sets the house a blazed and kills her brother and a parrot. This fire is a symbol that carries a lot of negativity unlike in Jane Eyre where fire held both positive and negative.