Only if those families are heads of state and occupy a political institution that supercedes democracy. So yes, any royal family made up of one race is structured in a way that doesn’t allow equal opportunity of access is by structure racist. That’s true of the Thai royals, the African royals and even the Kim family of North Korea. The individuals within the families may not be actively racist – but because there’s no equality of opportunity moving forward, and that opportunity is unequal on the grounds of skin colour (via genetics) – the structure is racist. Monarchy is racist.