Inthispowerfuldocumentary,MamaYang,an84yearoldwomanlivinginNewYork,findsherselfincorrespondencewith45highsecurityprisoninmatessheviewsasherownchildrenMostareChineseAmericanimmigrants,andseeinMamaYangamotherfiguretheyneverknewbeforetheysteppedthroughprisonwalls                                   　　ForMamaYangthough,thestoryisaboutmorethanChristiancharityShehadalreadylivedafulllifeinTaiwanwhenherhusbanddiedatagesixtyandhersonlosttheirhouseinafinancialblunderShemovedtotheUStostartanewandliveswithaTaiwaneseAmericangranddaughterthatremainsdistantInafilmmarkedbyfamilyseparations,MamaYangwritesletters–whethertotheincarceratedortoherowngranddaughter–toheallifetimesofwounds