老戴1977年结婚,婚后育有二女一子。儿子6岁时,老戴失业,后又因故意伤害罪被判入狱十三年。服刑期间,妻子与老戴离了婚,三个孩子一直跟随母亲生活。出狱后,老戴工作很不稳定,收入微薄,无法对孩子们尽到抚养义务。2009年,老戴与儿子小戴签订赡养协议:从2010年1月起,儿子每月承担父亲100元生活费;若 Old Dai married in 1977, married and have two women and one son. At age 6, Dai was unemployed and later sentenced to 13 years in prison for intentional assault. During his prison term, his wife divorced Lao Dai and three children were following her mother's life. After being released from prison, Lao Dai's work is very unstable and his income is meager. He can not fulfill his obligation to raise children. In 2009, Lao Dai signed an alimony agreement with her son Xiaodai: From January 2010 onwards, the son undertook the living expenses of her father of 100 Yuan per month. If