Moyo Studio/E+/Getty ImagesTuesday, 8:10 p.m. I’m helping my 87-year-old mother brush her teeth and change for bed. My 10-year-old calls from the room next door that he and his dad are done reading his latest Big Nate book. He asks (again) when I’m coming to his room to say goodnight. I try not to rush my mother, but I’m exhausted after a long day, and keenly aware of missing those precious minutes right before bedtime when you get the real deal from your child about everything that happened that day.After months of juggling my work as a therapist with caring for my aging mother (who has been...