Either you OR your dependant need to show 3 months statement. If you show both its OK, but not required.
Since you are in the UK and your dependant overseas, you will need to show £1600+£800 for 3 months constantly in either your or your partners bank account.
See this link for more details:
http://www.ukba.homeoffice.gov.uk/worki ... ntoffunds/
If the main applicant under the post-study worker category is outside the United Kingdom or has been in the United Kingdom for less than 12 months, the family member must show that the main applicant or the dependant has at least £1,600 to support the dependant as well as the funds needed to support the main applicant.
Please share the outcome of your application.... thanks.