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PraveenchanduPraveenchandu 

write a triger on Child object with below criteria

create object "Parent" create pick list field "Status" with values "ready,start,close"
create object "Child" create pick list field "Status" with values "ready,start,close"
create relationship between child and parent
create 3 record Types for child
1)Type1
2)Type2
3)Type3

eg: -Create record "ParentRecord"
-Create records in child object with 3 diffect record types "Type1 record,Type2 Record,Type3 Record"
-write a triger on Child object with below criteria
 "if one child record status==start  change the parent record parent record status==start
When all the records Status==Closed change the parent record Status==Closed
 when all child record status==ready parent record status==ready"