Chloe and Alexis are adorable kids. And also very active! Kids at this age require a steady hand and a lot of patience, but they sure are adorable. I always look for a shady spot and then let the kids play and have fun on their own. That way you get genuine expressions as much as possible, which is very important. You can always tell the genuine smiles and laughs from the fake ones, so it pays to get the good stuff!
90% shot with the 70-200, the rest are 24-70. All of these are available light and relatively low aperture/shallow depth of field.
Have a great week.