If a pure blood marries a half-blood what that make their kids?

well i think they are all pure bloods, becuse wizards/witches are only half-blood when they have one muggle/'normal' parent. since harry and ginny are both a wizard and witch their kids are all pure-blood. another example is, severus snape, he was a half-blood, but it was just because his father was a muggle. i hope this helped:)