library/car_driver/models/driver_member.py

from odoo import fields, models

class Member(models.Model):
    _name = 'driver.member'
    _description = 'Driver Member'
    car_number = fields.Char()
    partner_id = fields.Many2one(
        'res.partner',
        delegate=True,
        ondelete='cascade',
        required=True)