@LegoCaltrops
I recommend reading the book, "When she was white"
It's a true story about Sanny Lang who had white parents but when she got to school the headmaster had other ideas.
It goes through her 'reclassification' as 'Coloured', 'White' and I think 'Black' according to the ever changing rules of Apartheid.
The end of the book is post Apartheid and gives some insight as to the mindset of some (maybe most) white South Africans eg a man who didn't like the idea that he had to wash his hands in the same basin as a black person, but when asked who was OK with using the sink at home a black person cleaned.
For anyone who thinks SA is well past racism, it isn't. People couldn't suddenly move to an affluent (previously white) area or get a new job.
To send your child to school you have to pay fees unless you are poor, so schools that were previously whites only are still used by parents in affluent areas, the schools in the poor areas have no financial support from parents and therefore are badly resourced.
Class sizes vary from 30 - 50 students a class, and if you can't afford a trained teacher you employ an untrained one.
The advantages the OPs daughters have with a white parent, well to start they probably have underwear, bought new for them. In case you are wondering about periods, try holding a pad between your thighs with no pants.
Underwear is is a luxury to many. I once arranged for donated bras to go to SA, SA airlines took them free of charge. In this case they went to a names children's home.
You cannot do this now because businesses in the UK were taking donations of clothes and selling them as unseen bundles and basically dumping them.