I went through the suggested posts that came up when I typed this title and they did not solve my issue.
I have a model created with the Make Human program. head, eyebrows, hair, teeth, eyelashes are all separate meshes. When I tilt the head back the eyebrow and eyelashes sink down into the head. All the other meshes move with the head properly. I have tried to join the eyebrow and eyelash meshes to the head, when I did they disappeared.