src/Money/DataMapper/Data/Money/Budget.php
public function addChild(Budget $budget)
    {
        $this->children[$budget->getId()] = $budget;

        $this->addTransactionsAmount($budget->getTransactionsAmount());
        $this->addToGlobalAmount($budget->getAmount());

        return $this;
    }
public function addChild(Budget $budget)
    {
        $this->children[$budget->getId()] = $budget;

        $this->addTransactionsAmount($budget->getTransactionsAmount());
        $this->addToGlobalAmount($budget->getAmount());

        return $this;
    }
Add child

@param  Budget $budget
@return $this