I am a grandfather of these 2 children. One is 7 years old and the other is 2. They live with me with my daughter who is their mother. And my yellow lab Zeke.
We would need you to be at the home at 6 and occasionally earlier around 5 to 530. Then get the 7 year old on bus right outside. The rest of the day look after the 2 year old until 4 then get 7 year old off bus. At that point one of us would be home.