Non-family member sponsor family visitor visa application?

Hi,
I am British citizen marrying my Russian fiancee next june. We want her parents to come to our wedding so it is my understanding they need to apply for a family visitor visa, since the main reason they are coming is to see her. Now they don't have enough money to show they can support themselves and neither does my fiancee to sponsor them (she is on psw visa having just graduated from UK uni). My question is , is it possible to put myself down as financial sponsor, even though she will be the family sponsor in this case? Alternatively is it better to use general visitor visa putting myself down as sponsor ?

Many thanks for your time in reading my post and hopefully helping us out!

Here is what qualifies as a family visit.

Does No 5 not apply to you?

[quote]VAT2.4 What is a family visitor?

The same as for a visitor. Under the Immigration Appeals (Family Visitor) Regulations 2003, a family visitor is defined as:

1. the applicant's spouse, father, mother, son, daughter, grandfather, grandmother, grandson, granddaughter, brother, sister, uncle, aunt, nephew, niece or first cousin (NB: "first cousin" means, in relation to a person, the son or daughter of his uncle or aunt);
2. the father, mother, brother or sister of the applicant's spouse;
3. the spouse of the applicant's son or daughter;
4. the applicant's stepfather, stepmother, stepson, stepdaughter, stepbrother or stepsister; or
5. a person with whom the applicant has lived as a member of an unmarried couple for at least two of the three years before the day on which his application for entry clearance was made.

In addition:

* Children adopted under an adoption order recognised in UK law are treated as if they are the natural children of the adoptive parents; and,
* The Immigration Appeals (Family Visitor) Regulations 2003 pre-date The Civil Partnership Act (2004). Civil partners are considered “a member of the applicant’s familyâ€

batleykhan, thanks for your reply but no, the applicant being my fiancees mum/dad, i have not lived with them for 2 years.

anyone else with any help please?????