Hi,
I think I understand your question but let’s simplify it to avoid confusions.
Say you want to comment to A’s tweet in B’s tweet. What you need to do is:
- Go to B’s tweet and click on the upward arrow next to the heart, copy the link to the tweet. e.g. Say you want to post the link to my tweet as a reply to your cousin; use the arrow next to the heart on my tweet to copy the link to Tweet (see screenshot)
- Go to A’s tweet and click reply, write your comment (optional but recommended), and paste the link to the tweet of B that you copied in step 1. To continue the example above, go to your cousin’s tweet and click reply (1st icon below the tweet that is shaped like a call out). Now paste the link you copied.