Thanks @ancientgran
On to your point about mixed race kids, this is exactly what Meghan was talking about when she said to say she is white disrespects her mother's heritage, while to say she is only black disrespects her father's.
She has written very thoughtfully about being mixed race.
At the same time, as she has experienced, and I genuinely hope your kids don't experience it too, being mixed race, and having a white parent, as @skullbabe eloquently explains, is no protection against structural racism.
When people of colour are subjected to racism, to police brutality and general discrimination, there is no difference made between those who have a white parent, or grand parent. Race is a social construct, not just a purely biological one.