Re: Your parenting style
I would hate it if my parents (or anyone else for that matter) interfered all the time! Of course suggestions and tips are always welcome, but constant interference is not. Parents need to learn to let go and realize when their kids are old enough to handle their own lives.
I'd still try to keep calm though.. you wouldn't want to hurt grandma's feelings. I mean, in her mind, she's just trying to help. Let her tell you what she thinks, take it as a suggestion, and then do what you guys think is right.