Pengaruh mitigasi bencana, social support, dan social capital terhadap keberfungsian keluarga (studi kasus pada masyarakat rawan bencana erupsi Gunung Merapi di Kabupaten Sleman Provinsi Daerah Istimewa Yogyakarta) = The influence of disaster mitigation social support and social capital against the functioning of family (a case study on disaster prone communities eruption of Mount Merapi in Sleman Yogyakarta Special Region)