Parents sponsoring Fiance, what are the legal implications?

[newlight1]

My parents maybe sponsoring my Fiance for the UK on a Fiance Visa but they are worried about what the legal implications are for them and for how long they are bound by that? My parents are so so so negative people and said well what happens if she left you would we have to pay for her each week and how much and for how long

[EUsmileWEallsmile]

This question would be better posed in the immigration for family members section where you are more likely to get a response.