Hi Usman,

Try following Code

class MasterClass(models.Model):
        _name = 'master.class'

         o2m_f1 = fields.One2Many('o2m.table1', 'field')
         o2m_f2 = fields.One2Many('o2m.table2', 'field')

Class O2mTable1(models.Model):
         _name = 'o2m.table1'

         name = fields.Char()
         field = fields.Many2one('master.class')

         @api.onchange('name')
         def trigger_o2m_change():
                # Your Function Info.


Class O2mTable2(models.Model):
         _name = 'o2m.table2'

         name = fields.Char()
         field = fields.Many2one('master.class')

         @api.onchange('name')
         def trigger_o2m_change():
            # Your Function Info.

Thanks