In Student Sibling table, the current student id should not appear as sibling.
diff --git a/erpnext/schools/doctype/student/student.js b/erpnext/schools/doctype/student/student.js
index c7b1d46..d3d248b 100644
--- a/erpnext/schools/doctype/student/student.js
+++ b/erpnext/schools/doctype/student/student.js
@@ -1,6 +1,17 @@
 // Copyright (c) 2016, Frappe Technologies Pvt. Ltd. and contributors
 // For license information, please see license.txt
 
+frappe.ui.form.on('Student', {
+	setup: function(frm) {
+		frm.set_query("student", "siblings", function(doc, cdt, cdn) {
+			return {
+				"filters": {
+					"name": ["!=", doc.name]
+				}
+			};
+		})
+	}
+});
 
 frappe.ui.form.on("Student Guardian", {
 	guardian: function(frm) {