You don't have to force them to behave. They're going to run and play. They're going to jump and climb. If there is water, they will probably get wet at the end.
Kids help make some posing choices, because they have great ideas for their family.
We will not be sitting on a white wicker chair with a marble backdrop. We will use the location's beauty to give your photos that natural feel.
I am a teacher and I am an expert at managing kids. If I am having a hard time getting them under control, I will let you know. Otherwise, don't feel like you have to constantly be speaking to them about their behavior. My tolerance for chaos is high.