Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.1.0-beta)
// ----

.parent {
  &:hover {
    @extend %child_hover;
  }
}

.second-parent {
  &:hover {
    @extend %child_hover;
  }
}

.child {
  display: none;
}

%child_hover {
  .child {
    display: block;
  }
}

SassMeister-output.css

.child {
  display: none; }

.parent:hover .child, .second-parent:hover .child {
  display: block; }