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He was the grandson of [[Arai Kageyu]] (d. [[1609]]); his father was ''[[metsuke]]'' [[Arai Masanari]] ([[1601]]-[[1682]]), and his mother, a daughter of the [[Fujiwara clan]] by the surname Sakai ([[1617]]-[[1678]]).

He was the grandson of [[Arai Kageyu]] (d. [[1609]]); his father was ''[[metsuke]]'' [[Arai Masanari]] ([[1601]]-[[1682]]), and his mother, a daughter of the [[Fujiwara clan]] by the surname Sakai ([[1617]]-[[1678]]).

Hakuseki entered the service of the [[Hotta clan]] in [[1682]], at the age of 26, and later married a daughter of [[Asakura Nagaharu]], another Hotta retainer. His first daughter, Shizu, was born in [[1687]], but died in infancy, possibly at birth. His second daughter, Kiyo, was born in [[1689]]. Hakuseki's first son, [[Arai Akinori]], was born in [[1691]]; Hakuseki resigned from his service to the Hotta earlier that year.<ref>Ackroyd, 283n82.</ref>

Hakuseki entered the service of the [[Hotta clan]] in [[1682]], at the age of 26, and later married a daughter of [[Asakura Nagaharu]], another Hotta retainer. His first daughter, Shizu, was born in [[1687]], but died in infancy, possibly at birth. His second daughter, Kiyo, was born in [[1689]]. Hakuseki's first son, [[Arai Akinori]], was born in [[1691]]; Hakuseki resigned from his service to the Hotta earlier that year,<ref>Ackroyd, 283n82.</ref> and moved to a farm at Honjô, in [[Edo]], near the banks of the [[Sumidagawa]].<ref>Ackroyd, 284n86.</ref>

He was granted court rank in [[1709]].

He was granted court rank in [[1709]].