Law Office of Keith A Singer PLLC Tucson Family Attorneys - Law Office of Keith A. Singer, PLLC Call Tucson, AZ family attorneys Keith A. Singer and Grant L. Stratton at 520-795-1800. The Family Law attorneys at the Law Office of Keith A. Singer, PLLC offer experience and dedication. We welcome the opportunity to serve clients in the areas of divorce, paternity, legal decision making and parenting time for children, matters involving the Juvenile Court, property valuation and division, spousal and child support, extended family rights, and post-decree modification.