How we get List of sibling Contact in a Salesforce Trigger?

Hi Shubham,

You can refer this code for getting all the siblings of any contact.

Set<id> accid = new Set<id>();
for(Contact c : Trigger.old){
accid.add(c.AccountId);
}
List<contact> con = [select id, accountid, Start_Date__c, End_Date__c from contact where Account.Id in : accid AND Id not IN : Trigger.old];

Map<id,List<Contact>> mapAccIdCont = new Map<id,List<Contact>>();

for(Contact c :con){
if(mapAccIdCont.containsKey(c.Accountid)){
List<Contact> conList = mapAccIdCont.get(c.AccountId);
conList.add(c);
mapAccIdCont.put(c.AccountId, conList);

}
else{
List<Contact> conList = new List<Contact>();
conList.add(c);
mapAccIdCont.put(c.AccountId, conList);

}
}