Graduation Messages to Sister.by admin. A sister is a special sibling be it a younger one or an elder one. As such,the passing out of graduation of a sister calls in for great celebration among siblings who go out of their way to make the special success day much happier and brighter for the sister. Graduation Messages to Sister – Graduation Wishes Was this helpful? Graduation Messages to Sister – Graduation Wishes Graduation Messages to Sister – Graduation Wishes Graduation Message to Sister in Law. A sister in law is new member of the family.. College Graduation Message to Sister. College graduation for a sister means she is all set.. High School Graduation Message for Sister. Funny Graduation Messages Graduation Wishes for Sister - Congratulation Messages Graduation Wishes and Messages for Sister: Becoming a graduate is one of the most cherished dreams for anyone as it is a big milestone of life. If your sister recently completed her graduation then you should congratulate her for this big achievement and show your pride.