Maybe "Honor thy father and thy mother" : uncertain family aid and the design of social long term care insurance / Chiara Canta (Norwegian School of Economics), Helmuth Cremer (Toulouse School of Economics, University of Toulouse Capitole and IZA), Firouz Gahvari (University of Illinois at Urbana-Champaig) ; IZA, Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, December 2016