Aww, what an adorable photo!!! I love goslings when they're starting to get really big, they're so cute
I've found even mean springtime geese can be pretty easily, if begrudgingly, settled down when they're freaking out for no reason. Obviously, it's just hormones and there's nothing wrong with them being defensive to a degree, but if they're hissing or attacking me just for being there I'll just say "No!", point at them, or tap them on the beak. I've ended up at odds with the feistiest gander, King Sara, a few times for being within 10 feet of his mate, but even he will still respect it if I tell him off, and they all go back to being sweet pretty quick.