Mackenzie Brothers

Tropes applying to both

Barefoot Poverty: After the first quarter of an hour or so, they are usually barefoot unless they're attending school.
Children Are Innocent: Especially Davy.
- They genuinely don't realise the baby is Mr Hooft's daughter.
Conveniently an Orphan: Just look what happened to their parents.
The Cutie: Especially Davy.
Disappeared Dad: They lost their father in the Boer War.
Free-Range Children: They are often left to their own devices, this is what leads to them discovering Mr. Hooft's infant daughter.
Missing Mum: They lost their mother to illness.
Pet the Dog: They love dogs, especially Davy.

The 8 year old eldest Mackenzie brother

Big Brother Instinct: He's protective of Davy to the point of acting hostile to anyone who comes near him.
Fantastic Racism: He initially takes after his grandfather when it comes to his attitude towards Dutch settlers, especially the Hoofts.
Oh, Crap!: He has a brief moment of this when Davy falls into a stream.
- He quickly realises the trouble that awaits him when Davy warns him their grandfather and school teacher are looking for him.
Parental Substitute: He is this to Davy and tries to be the same for Mr Hooft's infant daughter.
Promoted to Parent: As a result of Conveniently an Orphan.

Harry's dog-obsessed 5 year old brother

Big Brother Worship: He seldom leaves Harry's side.
The Determinator: He wishes to be able to walk again straight after falling into a stream and injuring his knee but is advised not to for at least of couple of days.
Do Not Call Me "Paul": He thinks people who call him David don't like him.
Oh, Crap!: He has such a moment when he bumps into his grandfather and school teacher though it is much worse for Harry since he's the one they're looking for.
The Un-Favourite: He feels like this when people call him David.