mysql Error [1064] : EXECUTE

URI: index.php?option=com_agility&task=dogs&opt=sibling&id=9836&Itemid=25
Message: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'and mother_id = and id <> 9836' at line 3
SELECT COUNT(*) FROM elx_agl_dogs WHERE birthday = "2021-09-19" and father_id = and mother_id = and id <> 9836

mysql Error [1064] : EXECUTE

URI: index.php?option=com_agility&task=dogs&opt=sibling&id=9836&Itemid=25
Message: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'and mother_id = and id <> 9836 LIMIT 0,50' at line 4
SELECT * FROM elx_agl_dogs WHERE birthday = "2021-09-19" and father_id = and mother_id = and id <> 9836 LIMIT 0,50