I te Poutu-te-rangi 1887 i marenatia a Planck ki a Marie Merck (1861<unk>1909), tuahine o tētahi hoa kura, ā, i neke atu rāua ki tētahi whare noho i Kiel. E whā ā rāua tamariki: Karl (1888<unk>1916), ngā mahanga Emma (1889<unk>1919) me Grete (1889<unk>1917), me Erwin (1893<unk>1945). Pātai: E hia ngā tamariki a Planck rāua ko Merck?
e whā