void RotateSon()
    {
        if (CheckGrid(0, -1) && CheckGrid(0, 1))
        {
            return;
        }

        else if (sonActualPos == SonPosition.up)
        {
            sonActualPos = SonPosition.right;

            if(CheckGrid(0,1))
            {
                RotateSon();
                return;
            }

            son.transform.localPosition = Vector3.right;

            ChangeLimits(2, 1, 1);

        }

        else if (sonActualPos == SonPosition.right)
        {
            sonActualPos = SonPosition.down;

            if (CheckGrid(-1, 0))
            {
                RotateSon();
                return;
            }

            son.transform.localPosition = Vector3.down;

            ChangeLimits(1, 1, 2);

        }

        else if (sonActualPos == SonPosition.down)
        {
            sonActualPos = SonPosition.left;

            if (CheckGrid(0, -1))
            {
                RotateSon();
                return;
            }

            son.transform.localPosition = Vector3.left;

            ChangeLimits(1, 2, 1);

        }

        else
        {
            sonActualPos = SonPosition.up;

            son.transform.localPosition = Vector3.up;

            ChangeLimits(1, 1, 1);

        }

    }