Linda I. Gibbs, 50, one of the city's six deputy mayors, has a portfolio that includes homelessness, child welfare, aging, hospitals and juvenile justice. On Sundays, she mostly sticks to more cheerful pursuits in Brooklyn. Ms. Gibbs lives in a loft in Brooklyn Heights with her husband of 17 years, Tom McMahon, 55, a government relations consultant, and their two children, Ryann, 16, and Leo, 14. JULIE BOSMAN READING AT DAWN Five o'clock is a typical get-up time, which I actually like, because until 7 or 8, it's totally quiet. And it's a chance to do reading. I hesitate to say it, but I'm in three reading groups. And so one is mostly fiction and two are nonfiction. One of those is a whole range of disciplines by intention, so there's anthropologists and sociologists and psychologists. I'm the token lawyer. And the idea is to try to bring different perspectives to things that we read, and we read a lot of history, philosophy and science. We just finished Sir Thomas Aquinas's political writings. [ABSTRACT FROM PUBLISHER]