请教下 extend visit pass需要教的材料

给婆婆   extend visit pass，被要求提交以下材料，请问第 5 点所需材料是什么？
Please call in person together with your local sponsor at ICA Building, Visitor Services Centre, Visit Pass Unit, 4th Storey, 10 mins before your appointment time, with the following original documents:

• 1· COMPLETED FORM 14
• 2 APPLICANT'S DISEMBARKATION / EMBARKATION CARD
• 3 YOUR VALID TRAVEL DOCUMENT/PASSPORT
• 4 LOCAL SPONSOR'S IDENTITY CARD5.
• 5 DOCUMENT(S)TO SUBSTANTIATE YOUR RELATIONSHIP WITH THE SPONSOR, WHERE APPLICABLE
• 6 A COPY OF THIS NOTICE.