Code to Get All Parent and Child Object For A Give Object

Parent Object

Set<String> testName= new set<String>();

public Map <String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();

Map <String, Schema.SObjectField> fieldMap = schemaMap.get('Account').getDescribe().fields.getMap();

for(Schema.SObjectField sfield : fieldMap.Values())

{

schema.describefieldresult dfield = sfield.getDescribe();

if(dfield.getRelationshipName()!=null){

SObjectField sObjfieldName  =dfield.getSobjectField();

//System.debug(sObjfieldName  );

String abc=sObjfieldName  +'';

Map<String, Schema.SobjectField> fields = Account.getSObjectType().getDescribe().fields.getMap();

Schema.DescribeFieldResult f=fields.get(abc).getDescribe();

for(Schema.SObjectType reference : f.getReferenceTo()) {

testName.add(reference.getDescribe().getName());

}

}

}

for(String itr :testName){

System.debug(itr );

}

Child Object

// To Retrieve Sechma of the given Object

Schema.DescribeSObjectResult R = Account.SObjectType.getDescribe();

// Reterieving relation ship field

List<Schema.ChildRelationship> C = R.getChildRelationships();

Set<String> abc= new Set<String>();

// iterating all the fields

for (Schema.ChildRelationship child : r.getChildRelationShips()) {

   // from field getting its sobject describe call

   Schema.DescribeSObjectResult childDesc = child.getChildSObject().getDescribe();

   // from that getting its name and passing in set

   abc.add(childDesc.getName());

}

for(String itr :abc){

System.debug(itr);

}