Thanks, Purringfox!
Quick analysis of Purringfox's chart
Mom Miss Puffins has Grotto shown and possible Exotic Breeze or more recessive hid
Dad has Galaxy Sun and probable Exotic Journey or more recessive hid
Baby shows Galaxy Sun
Galaxy Sun would be dominant to Grotto or the hidden Exotic Breeze or more recessive. We wouldn't know the hid unless the baby's hidden was proved against a more recessive eye.
On 8/1/16, Dreampoetz posted a chart showing the baby's hidden.
http://kittycats.ws/forum/showthread.php?tid=26789
Mom has Onyx
Dad has Galaxy Sun
Baby has Grotto, proving Grotto is the hidden of Galaxy Sun
I am posting the chart from the other thread here in case someone comes to this thread checking on Galaxy Sun in the future and misses the other thread so they can see the proof.