"Hawkwing, that was good advice you gave Curlypaw. I’ve noticed you’ve not been yourself lately. Of course, you have good reasons, but you can’t live your whole life like that. You have to believe what you told Curlypaw, too. You’ve got your whole life ahead of you, you know?"
Though Hawkwing can be prickly sometimes, Blossomheart knows her brother's heart is in the right place. When their patrol was attacked by a swarm of badgers, Hawkwing fought viciously to defend his sister, determined not to lose another littermate. The siblings reminisced about the gorge together on their journey to the lake after being driven out by Darktail, and her brother's romance with Pebbleshine amused her. When Hawkwing became depressed after his mate's death, Blossomheart worried heavily for her brother, especially when he refused to eat, and encouraged him to recover from the loss. Later, as Blossomheart became terribly ill, Hawkwing stayed by his sister's side, terrified to lose the only littermate he had left.
"I’m so glad we’re all together again. Hawkwing and I have been so worried."
—Blossomheart to Cherrytail and Cloudmist after SkyClan is driven from the gorge Hawkwing's Journey, page 223
Blossomheart has a good relationship with her family and likes to spend time with them. As an apprentice, she chose not to take part in Duskpaw and Cloudpaw's plans to steal Twoleg food, though she misses her brother after this behavior caused his death, and wishes he could have lived to become a warrior. When Cherrytail and Cloudmist decided to stay at Barley's farm rather than follow SkyClan in search of the other Clans, Blossomheart was distraught, and insisted to her mother that she and her siblings still needed her. When they were reunited moons later, Blossomheart was overjoyed to welcome them back to SkyClan. Her relationship with her father, Sharpclaw, is mostly unknown, but Blossomheart was saddened by his death and comforted Hawkwing when he blamed their father's death on himself.
"Hawkwing felt especially sorry for Pebblepaw, who stumbled along in a daze, as if she was overwhelmed by mourning and her sense of guilt. Blossomheart padded alongside her, silently offering her sympathy and support."
Blossomheart and Pebbleshine were close friends who trained together as apprentices. They bonded together on their journey to find the other Clans, though when Darktail's directions lead the patrol into a mess of badger dens and Pebblepaw's mentor, Billystorm, was killed, Blossomheart helped her friend grieve. When Pebblepaw stopped eating after his death, Blossomheart encouraged her to push past her grief in order to take care of herself. When Pebbleshine, pregnant with Hawkwing's kits, devised a plan to steal chickens from a Twoleg monster, Blossomheart urged her to be careful, and yowled in horror as she was taken away, never to be seen again.