You can use any title you would like to. For example - you can use one of the sayings for Sister and use it for Aunt. Words can be changed. Also the words can be either singular or plural (example - "we love you" or "I love you").

Grandfather:
My heart holds a love which belongs only to my Grandfather. A love so strong nothing can take apart, unravel or even tear. Mixed in with that love are the memories that only we share and will fill it with Memories still to come. Only a Grandfather can turn tears into laughter, never say, "I told you so," and truly listen to and understand me. When I look at you with my pleading eyes, it’s clear to me you Will let me get my way. You will look the other way, only to stand In the way when I shouldn’t get my way. Holding hands as we walk will someday be replaced with long Talks as we walk. My Grandfather are so special. I will hold onto their love forever and return it with much more. ( ITEM #S1 )

Grandpa: What I have learned from you, Grandpa, is how to be a person with strength and gentle at the same time. How to weather the storm and always come through it all. You have given to your family a sense of security nestled in lots of love. You surrounded us with your kindness leaving a sense of peace all around. You built your family with your wisdom and completed it with the wisdom from God. I have learned how to be the best person I can be from you.
( ITEM #S4 )

My grandfather: No one in the world can take the place of my grandfather. The warm welcome you give me when I see you and the love you so freely give can come from no other then you. Everything I do, as you see it, is perfect and always has your approval. You always find the time for me and put everything else aside, just for me. You always make things seem better when things just aren’t going my way. Just for me, you have many words of wisdom in such a caring way. There is something special between us; an understanding we have only for each other. For you, I will return to you all you have given to me. I will always be there for you and there is always time, just for you. When you need words of wisdom, I know I can give it to you. After all, I have learned from no one other then you. You always have my approval, for you are the most perfect Grandfather. I have lots of love tucked aside, just for you.
( ITEM #S2 )

Grandpa: (Your so special) You have always been by my side. Never let me feel alone. I know you’ve tried to keep me from the hurts in this world by teaching me right from wrong. For all the lessons I’ve learned in life, it’s from you that I have learned. It’s your voice that turns me in the direction I should go, along with your prayers. You always have the right words to say and the right time to say it. Never wanting anything for yourself, but always seeming to have it all, of what really counts in life. I just want you to know that I am so thankful and honored that you are my grandpa. You are so special to me. Thank you grandpa and I love you!
( ITEM #S3 )