Breakdown of otouto to imouto ha syougakkou ni kayotte imasu.
はha
topic particle
いるiru
to exist; to stay; to have (used for living beings)
にni
at; on; in; to; for [indirect object particle]
とto
and; or; with
妹(さん)imouto(san)
younger sister
弟(さん)otouto(san)
younger brother
小学校syougakkou
elementary school
通うkayou
to commute, to go (somewhere regularly)
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