This comic wound up having to be rewritten quite a bit from the original after some things I thought wer common knowledge among readers were quickly proven to not be common knowledge after the previous comic.
1 - Diane is confirmed to be adopted. There is no question about that, but it's a very important detail.
So yes. Emergency "these details are very important for understanding Nanase's logic" recap. On the plus side, this means Elliot's suggestion of asking Tedd's dad got to wait until the end of this comic, making it something of a Friday cliffhanger, so it all worked out in the end.