Suggestions by @panicof1873

Tom Brittney

as #26 in Celebs who could play siblings in a movie

Score: +1

Jack Farthing

as #27 in Celebs who could play siblings in a movie

Score: +1

Oscar Isaac

as #24 in Celebs who could play siblings in a movie

Score: +1

Mark Bonnar

as #194 in Celebs who could play siblings in a movie

Score: +1

David Tennant

as #194 in Celebs who could play siblings in a movie

Score: +1

Daniel Radcliffe

as Will Davenport in Grantchester

Score: +1

Henry Pettigrew

as Larry Peters in Grantchester

Score: +1

Sara Vickers

as Demelza Poldark in Poldark

Score: -1

Jack Farthing

as The Antagonist in Actor's You'd Want To See In A Revenge Movie

Score: +2

Michael Sheen

as The Antagonist in Actor's You'd Want To See In A Revenge Movie

Score: +2

Mark Bonnar

as Crowley in Good Omens

Score: 0

Michael Sheen

as Stede Bonnet, a pampered aristocrat in Our Flag Means Death (1992)

Score: +1

Michael Sheen

as Edward Teach aka Blackbeard the legendary pirate captain. in Our Flag Means Death (1992)

Score: +1

Andrew Garfield

as Lucius, a scribe on the Revenge tasked with keeping a record in Our Flag Means Death (1992)

Score: +1

Ian Alexander

as Bonifacia Jimenez/Jim, a skilled fighter in Our Flag Means Death (1992)

Score: +1

Harry Styles

as Drake in Poldark

Score: -1

Sadie Sink

as Morwenna in Poldark

Score: +1

Timothée Chalamet

as Sam in Poldark

Score: +1

Vanessa Kirby

as Caroline Enys in Poldark

Score: +1

Lucy Liu

as Elizabeth Warleggan in Poldark

Score: -1