Can any westerners help me understand something (Americentric viewpoints preferably but others are welcome as well) : Are half siblings from the same mother considered to be more valid than half siblings from different mothers? Like if you have a half sibling, and you have the same mom, people don't think anything of it and consider you siblings. But when you're half siblings with different mothers, people don't actually consider you to be siblings, although when pressed they will admit you're technically siblings.