depressed donna oettinger , 41 , had sought urgent psychiatric help in the months before she and her son zaki died on train tracks in south london .
she had starting suffering depression after going to zaki 's father , mohammed el shaer , in egypt , and discovering he had another family , an inquest heard .
her mental health had declined after discovering zaki 's father , an egyptian national who could have be done ' to foresee the deaths .