Danyal Hussein is accused of killing sisters Nicole Smallman, 27, and Bibaa Henry, 46, in Fryent Country Park in Wembley in the early hours of Saturday 6th June.
Their mother Mina Smallman is the former Archdeacon of Southend in the Diocese of Chelmsford.
The Acting Bishop of Chelmsford, Rt Revd Peter Hill wrote on 10th June: "We are devastated to hear of the tragic deaths of Nicole Smallman and Bibaa Henry in North London at the weekend. Nicole and Bibaa were the daughters of our former Archdeacon and good friend Mina Smallman.
"This is heart breaking news and the thoughts and prayers of everyone at Chelmsford Diocese are with Mina and her family. We ask that their privacy is respected and for everyone’s prayers at this most difficult of times."
The women were found stabbed to death on Sunday 7th June after officers were called shortly after 1pm.
Hussein, of Guy Barnett Grove, Blackheath, south-east London, will appear at Westminster Magistrates’ Court on Thursday, charged with two counts of murder and a further count of possession of an offensive weapon.
The teenager was arrested in the early hours of Wednesday.
Metropolitan Police North West BCU Commander Roy Smith said: “I would like to thank the local community for their support, both with the investigation and the police activity at and around the scene.
“I know that colleagues from across the Met have been working tirelessly on this investigation.
“My officers will remain on patrol in the local area, providing continued reassurance – please do stop and speak with them if you have any questions or concerns.”