Girrrrrrrrrrrrrrrrrrl - I have SO been in your shoes!
I'll tell you what I told them:
1. If one of my sibs was pregnant, you would NEVER say that to them. It's the same dang thing.
2. When you are living my life and raising my kids for me, you can have more say in what I do.
3. Every woman/couple KNOWS when their family is complete. I KNOW my family is not complete.
4. This is what I'm doing, and if you can't be supportive, that is your choice. But if you can't accept all of us (since you already have kids), you can't be in our lives. That's a choice you have to make.
5. Sorry, was I asking your opinion? Because if we're sharing opinions here, let me tell you a few things about your life and priorities.
Ok.................those last few are a bit snarky, but...............frankly I AM a bit snarky.
Seriously, though, if you've read any of my posts for the last year, this has been a HUGE issue for me. In the end, I chose MY life and MY children and reiterated that my choices are just that - MY choices. They couldn't live with that, and currently are not involved with our life. I don't know if they'll come around eventually or not, but I realize that that is THEIR issue, not mine.
(thank you, SNPTF therapy group!)
Just my .02!
Sandy
__________________
Proud foster mama of many;
Proud transracial adoptive mama of:
J, age 9-1/2, and Q, age 7 (OMG!!!)
Still hoping for more kids..... 
Nellie (the cat), adopted stray
"Friends are the family you choose."