U.S. broadcaster Reelz is to air a documentary series about Charles Manson's family – funded by British distributor DRG. Manson's Bloodline is a four-part series that will tell the story of Charles Manson's grandson, Jason Freeman, and how he came to terms with his notorious grandfather's murder spree. It comes in advance of next year's 50th anniversary of the killings. The series, which will be delivered in late summer, will be produced by Breaking Borders producer My Ent…