Board Thread:Theories and Speculation/@comment-31080833-20170118082413

In written form, Shinki refers to Gaara as "Foster Father", so I think it is safe to say Gaara still has no produced a biological heir, yet.

In Gaara's Hiden novel, the Suna council tried to force both Kankuro and Gaara to take wives, in order to produce an heir to Sungakure. Temari is now a Nara, which leaves Shikadai the heir should both Kankuro and Gaara die in battle. The council is worried this would upset the balance of power, by allowing a son of Konoha to rule them. Gaara says Kankuro should marry first being eldest, but Kankuro says Gaara should marry first, being Kazekage. So, the Council decide to arrange a marriage-meeting for Gaara after Naruto and Hinata's wedding (making Gaara roughly 20-21 years old during this time). However, the girl he is "intended" to ends up faking her own kidnapping to run away with her real lover. Gaara shows them mercy, because he never inteded on forcing anyone to marry him, and lets her and her lover go - asking Shikamaru to let them take on identities in Konoha as Nara clan members.

Therefore, this left Gaara single and childless as far as I have come to understand. Which may have resulted in him taking in orphans to satisfy the council. I do not see Gaara forcing anyone to be his wife, and he is likely too shy and awkward to try to bud a romance with anyone. He attempted to emulate Naruto in the Hiden Novel, by asking his "intended" what her hobbies were, mush to Temari's embarrassment.

Shinki is likely a clan member of the 3rd Kazekage, who used Magnet Release, because Gaara doesn't actually have the Magnet Release Kekkei Genkai (His father Rasa, 4th Kazekage did, however, like Temari, Gaara uses Wind Release).

In the Boruto manga, Shinki seems highly motivated to not disappoint Gaara, who took him in.  