public double Get_second_child_pocket_money_amount(string short_date_time)
{
const int dateColumn = 1;
const int amountColumn = 4;
var sheet_name = PocketMoneySheetNames.Second_child;
int row = _spreadsheet_io.Find_row_number_of_last_row_containing_cell(sheet_name, short_date_time, dateColumn);
return(_spreadsheet_io.Get_amount(sheet_name, row, amountColumn));
}