Child to parent updation in salesforce

Trigger ContactTrigger on Contact (after update){
Map<Id,Contact> mapcon=new Map<Id,Contact>();
List<Account> acclist=new List<Account>();
for(Contact con:Trigger.new){
mapcon.put(con.AccountId,con);

}
acclist=[select Id,Name,Email__c,(select Id,AccountId,Name,Email from Contacts) from Account where Id in:mapcon.keyset()];
if(acclist.size()>0){
for(Account a:acclist){
a.Email__c=mapcon.get(a.id).Email;

}
update acclist;

}
}