I’d like to have the following class configuration.

class Parent
{
    protected ParentMapperInterface $mapper;

    public function __construct(ParentMapperInterface $mapper)
    {
        $this->mapper = $mapper;
    }
    
    // other methods that I would like to be available to all children
}

class Child1 extends Parent
{
    protected Child1MapperInterface $mapper
    
    public function __construct(Child1MapperInterface $childMapper)
    {
        $this->mapper = $childMapper;
    }
}

class Child2 extends Parent
{
    protected Child2MapperInterface $mapper
    
    public function __construct(Child2MapperInterface $childMapper)
    {
        $this->mapper = $childMapper;
    }
}
// other children

Child1 extends Parent and has its Child1Mapper under $mapper property. The same is for Child2.
Child1Mapper, Child2Mapper extend ParentMapper. I made such class configuration because Child1, Child2, etc. share
same methods as Parent, and Child1Mapper, Child2Mapper, etc. share some methods of ParentMapper.
The problem is that with this configuration I get a PHP error that signatures of __construct methods of Parent
and Child should be the same.

Any idea how to get what I want?