Is it acceptable to have two sets of Godparents?

We asked my husbands sister and her husband to be godparents back in August when I first found out I was pregnant. But now I'm seriously reconsidering letting them raise my son if, God forbid, my husband and I are no longer around. They already have five kids of their own but I have some issues with how they parent... Anyway, I was thinking of asking my friend and her husband to be Godparents also, and maybe asking them if they would take him. So can I give my boy two sets of godparents?