Hoshizen Family
From Kokorodatabase
The Hoshizen family usually does not appear in Kokoro, despite being related by marriage to Hoshizen Daisuke and Shirogane Ichigo. Usually, the family only appears by mention only, and has yet to actually make a real appearance.
Hoshizen Kinkou
Kinkou Hoshizen is an only child, and one of the last heirs to Hoshizen on her side. She is the wife to Kinomiya Hokori, as well as the mother to both Hoshizen Daisuke, and her own son, Hoshizen Shinnen. As a mage, Kinkou naturally has command over the element of Weather, and uses a violin in battle.
According to Daisuke, Kinkou is a fairly friendly person. She loves anything cute, and apparently adores Kuroneko Satou almost as if she was her own child.
Kinomiya Hokori
While only a Hoshizen by marriage, Hokori is Daisuke's adoptive father, husband to Hoshizen Kinkou, as well as father to his son, Hoshizen Shinnen.
Not much is particularly known about Hokori other than he is the older brother of Momomiya Sakura (Ichigo's mother). As a mage, Hokori is known to be a Nature Mage, but chooses to bond with animals instead.
Hoshizen Shinnen
He is Daisuke's younger brother, as he is the only blood child of Hokori and Kinkou. Since he's only two years old, there isn't much to mention about him.