Finally I got them, but they're all grown up and

Mama Duck isn't so over-protective anymore.

The duck at the upper left is the one we think is the mama - still kind of keeping an eye on her kids. You notice she let a couple of geese and some white ducks near the kids, so we guess they've grown up enough that she's cutting them some slack. We also saw a turtle, but my picture of it did not turn out too well - you can hardly see it.