left Join problem

[kproc]

HI

The below code is supposed to bring together multiple tables but for some reason its retuns repeat results for the query

based on my test data it should return DylanJennifer

but its returning DylanJenniferTylerJennifer

any ideas why

thank you

            $query_get_Birthdays = ("SELECT * FROM users LEFT JOIN parent ON parent.owner_id = users.user_id LEFT JOIN children ON children.owner_id = users.user_id LEFT JOIN sibling ON sibling.owner_id = users.user_id WHERE month(childdob) = '3' OR month(spousedob) = '3' AND users.user_id = '$user_id' OR month(siblingdob) = '3' AND sibling.owner_id ='$user_id' OR month(parentdob) = '3' AND parent.owner_id = '$user_id'");

$get_birthdays = mysql_query($query_get_Birthdays) or die ("Invalid query". mysql_error());

while($birthdays = mysql_fetch_assoc($get_birthdays)){
echo $birthdays['childfirstname'];
echo $birthdays['spousefirstname'];
echo $birthdays['parentfirstname'];
echo $birthdays['siblingfirstname'];
}