I have email address and personal info, how do i get into account

I need to get into my wifes peoplepc account. I have her member name, and personal info...However, the answer to her security question is not actually what she is asking...Example: security question is "what is my fathers middle name"...I know her fathers middle name..And that is not what she is using.

How can i get pasword to get into that account?

This information is going to be used in our divorce..She has emails in her account in regards to infidelity, and it would help my case.

Any information available would be appreciated.