We identified three rare deletions in KCNJ6, UNC13C, OTOL1 and 7 rare duplications in CNTNAP2/MIR548F3, CORO7/VASN, DTNB, EMID2, KCNF1, PDPR and SGTA/THOP1 that are present in children with bipolar disorder (and their parents). Here, OTOL1 is linked to bipolar disorder.