I only have 2 right now but plan to have at least 1 more, although I would like to have 4 too! I grew up with an odd number of kids, 5, and was closest to my 2 younger siblings. My younger brother and I are still extremely close, my older siblings are a lot older so we didnt have the same relationship. I would still be very close to my little sister but she passed away almost 12 year ago now. Anyhow...I think the relationship dynamics could change for my girls when we have a third but not in a bad way. Also, not that this is something any parent wants to think about, but I am glad I still have my little brother since I lost my sister. It would be a lot harder to have been left without a sibling. Good luck with you decision. Its definitely a tough one! Pray about it if thats something you are comfortable doing. I am sure you will end up making the best decision for you family!
:)AJ