With us, we have had "almost" 100% support from our families. I have 1 BIL that will toss out a smart remark every now and then. And the thing is he has 2 adopted kids of his own (his wifes 2 teen daughters). And since HE has had tons of problems, he assumes that all adopted kids are problems.
Then we get "I just don't see how ya'll do it" from other family members. Thats only because they can't or wouldn't even try themselves...and these are the ones that have awful relationships with their own kids.
I always said that I wanted 4 kids..2 boys and 2 girls..and thats exactly what we have..and all 4 severely special needs
Everyone here is betting that we'll get more, but NO our family will be complete..unless one or 3 drops from the heavens.
Only you know when your family is complete. Only you know what you can handle. I say go with your heart and be happy.