DS is almost 6 (in 2 months) and DD is 16 months. My son is very excited. He has been to a few appts with me, and loves being a part of this. He has already asked if her could help the midwife deliver the "identical cord" & the "plancenta" ...lol. He has been around me encapsulating placentas A LOT lately and has become very fascinated with it all. My daughter doesnt really know what is up...she is too little. I dont have a belly yet for her to be told that there is even anything in there. Once it gets bigger I am sure I can explain that there is a baby in there.
Im not doing sibling gifts, I agree with someone above that their baby brother/sister is a gift. We are not finding out the sex , and my son is really excited about this. He loves surprises! I understands that it could be either a boy or a girl. He has said he would like to have a baby brother since he already has a baby sister...but doesnt really care either way.
We are having a homebirth and I plan on having both of my children there. My mother will be at the birth to tend to both of them.
As far as preparing my kids for the homebirth, i will probably do what I did with my son when i was pregnant with his sister: watched a lot of homebirths on you tube (and talked about the sounds that the woman was making), make sure he saw my pregnant body as normal (showers, getting dressed etc), and reading books about the baby together.