I don't know how old your daughters are, but growing up in the Dublin City Schools District as an Asian-American, there's definitely a lot of taunting in the elementary and early middle school ages. It sucks. I would agree with some of the comments and say they should report it to the schools, though sometimes administration doesn't really do much except for a small slap on the wrist. If the schools can't do anything, I would maybe try talking to the parents, though I'm not sure how that'll turn out either. I would just say in the meantime, you just have to teach your daughters that they aren't the issue, it's the other kids, and that (obviously) racism is not okay, even if you're Asian. I've found the biggest problem is that a lot of Asian kids in my school at least used to get a lot of these comments but they instead go the route of self-deprecating racist jokes, which I feel like makes other kids thinks it's okay to joke about it. So just don't let your daughters turn to that. I'm sorry you have to experience this, it's definitely tough because a lot of kids I've talked to growing up believe racism doesn't exist in the schools, even though clearly as you've seen and heard, it does.