Turning down an adoptive placement

Ugh. I HATE saying NO. But, I know we aren't equipped to deal with this sibling group. We set our guidelines, 1 child or 2 if they're siblings. Well, it's a sibling group of 3. Our house just won't work with 3 or more. We are a 1-2 child home. I know these kids will get adopted but I hate saying no! 8 y/o girl 2 y/o boy 1 y/o girl Fingers crossed that these little ones can get an adoptive home together.