*Disclaimer to Grandparents: No, this is NOT what you think it is. Please read on before you start freaking out.
I do believe that we would love to have a sibling for you. Daddy and his brothers are very close, and I love my brothers a ton, too. I want you to be able to share your childhood, and later adulthood, with a brother or sister that you can count on to be your friend and family when and if Daddy and I cant be there. I think that learning to share and compromise with a sibling is a valuable life lesson. Siblings can also help us learn to take care of others, and you are already such a nurturer to younger babies. Little Leanna Kitchen comes to play on Tuesdays and Thursdays, and you are so sweet to her. You help bring her toys, give her patpats and look to me to make things right when she cries. You worry about her. It makes me smile.
A concern I have for you being an only child is that maybe single-child-ness would be hard. I dont ever want you to feel pressured by us, and I dont want you to feel like all of our hopes and dreams or whatnot are riding on you. We want you to be your own person and strive to never pressure you, but I can see how if you were an only child, you might also pressure yourself. I dont know if having a sibling would help that at all, since all first borns seem to be over-achievers, but I think that maybe it would keep the only child from feeling like the parent's "everything." Does that make sense? (this is a tough topic to write about, but it has been burning in my brain for a while now.)