All Have Jewels

Family:
The only confirmed members of Cosmo's family is her mother Hertia (Earthia in the English dub), who is the leader of the Green Planet council, and her older sister, Galaxina, who worries about Cosmo and her mother.

Earthia/Hertia: Her mother, who is the leader of the Green Planet council. She decides to leave the planet when it becomes too dangerous, but is later killed after the Metarex board her refugee ship. In the dub version of Sonic X, she is instead known as Earthia. During Episode 78, she appears to Dark Oak--now returned to his form as Lucas--and speaks with him, telling him...

Cosmo became good friends with Sonic and friends, but most particularly with Tails. The two of them ended up alone on a mission together at one point. Tails later protected Cosmo when Shadow targeted her for assassination. Tails continued trying to stop Shadow even when he was very badly injured by him. In the Japanese version of episode 77, Tails screamed I love you, Cosmo!, just before he fired the Sonic Driver towards her and Dark Oak.

Also, when the team went to an alien planet, Amy bought a potion that when two people fall into a pool of potion (that had been poured into the pond), they...