hi,
If you will be studying in the UK for six months or less, you cannot bring your family members to the UK.
If you will be studying in the UK for more than six months, you can bring your family members to the UK. They must be able to support themselves financially for the entire length of their stay without needing help from state benefits (also known as public funds).
Family members (also known as dependants) are:
your husband, wife or civil partner; or
your unmarried or same-sex partner; or
your children aged under 18 years old.
The money that your family members will need to show depends on your own circumstances, including:
the length of your course;
where you will be studying; and
whether you are currently studying or have recently studied in the UK.
Your family members (or you) must have enough money to cover their monthly living costs. Your family member may have to pay a lower amount of living costs if you are applying having completed a course, or are about to complete a course of study in the United Kingdom that was at least six months long in the past four months. If your family member does not have enough money and cannot prove it, their application will be refused.
The amount of money that your family members (or you) will need to show (as well as the money you must show to cover your own living costs in the United Kingdom) is:
Where you will study Money needed
In London
Each of your family members will need to show that they (or you) have £533 per month, for each month of your course up to a maximum of nine months
Outside London Each of your family members will need to show that they (or you) have £400 per month, for each month of your course up to a maximum of nine months
visa form at
http://www.ukvisas.gov.uk/en/howtoapply/vafs/
named
Application form VAF10 - PBS Dependant
PBS Dependant guidance notes