They don’t teach us that when we’re kids. When we’re little, the routine is a big part of our existence and we rely on it as much as we chafe at its boundaries: on weekdays we wake up and get dressed for school, following a specific route from home to class and back; we meet who we’re supposed to meet when we meet them and homework is done on the dot. We have a prescribed dinner time, family time and bedtime and our birthdays arrive on schedule every year. During adolescence we fight to tear up the schedule and we become adults when we realize how our parents fought to keep the reality of change from impinging on our routine. Adults know the only constant in life is change and to survive they must learn to adapt. Sometimes in the process they make mistakes but that’s a part of learning to adapt. This is the undercurrent of Elisabeth Egan’s debut novel, A Window Opens, and her heroine, Alice Pearse, starts the story understanding the need. As a veteran of the sandwich generation she’s a mom to her children and a daughter of parents who all need her at the same…