The sisters said it seemed as though the Met had an “urgency” to arrest him and tell the press.
“He couldn’t understand why there wasn’t an urgency to help clear his name,” they said.
Describing Brandram as a “very, very, very loved brother and uncle, father, son”, the sisters said he was a “real family man” and “didn’t deserve any of this happening to him”.
Brandram was linked to the incident in April when a person contacted officers with information that opened new lines of inquiry, according to the Met.
His arrest was deemed proportionate by officers in order to seize and search his devices as part of the investigation.
The force emphasised that it had not named Brandram publicly when he was arrested or at any point before his death.
The Met said the investigation into the 2017 incident remained ongoing.
It added that it had no further comment to make in relation to the sisters’ comments.
Listen to the best of BBC Radio London on Sounds and follow BBC London on Facebook, external, X, external and Instagram, external. Send your story ideas to [email protected], external
