The other day I was at my daughter’s swim school, watching her dive underwater to retrieve a ring from the bottom of the pool. She’s in the “big kids class” which means no parent is in the pool with her. I gaze down at my now 10 month old son, while I feed him a bottle as he watches her sister’s every move. My mind tries to be present for both. Cheering for my daughter as she looks right at me after back floats and keeping the bottle still while my son’s head follows her at the same time. An older woman passes me on the way to the lobby,…