Board Thread:General Discussion/@comment-32003099-20160726223819/@comment-33883848-20191027161239

By logic, Sans and Papyrus CAN'T be related by blood because skeletons don't have blood....And souls(that generates magic)can't be created "artificially"by monsters and thus it's unlikely that their parents shared their magic DNA or something with them.Nothing even implies that magic contains "DNA"of a monster.

So i think they are brothers just because they grew up together and developed a sibling like relationship and love ,not because they share the same magic DNA or blood ,that of course doens't make them brothers any less because family isn't just about genetics ❤❤