Sponsored 3 persons at time of application but now want one person only

[yeyes_17]

Hi! please help. I applied for my family sponsorship back in 2008. It includes my father, mother and sister. Back then I met the required income to sponsor them all. We dont have a baby too back then. Since its a long processing time a lot changes in our financial situation and I can only sponsor one of them. Is that possible? To change who would I sponsor without doing it all over again. Since its a looooooong wait before they made a decision?