Distinguish a quote from a new reply
In a furniture collection thread, the first message might say Saturday and the last confirmed reply might say Sunday after noon. Record Sunday with the agreed window. If the last reply merely asks “Would Sunday work?”, leave the appointment unconfirmed until the other person accepts. Look at who wrote each sentence. An old paragraph at the bottom of a later email retains its original meaning; the date on the forwarded message does not make that paragraph recent.
Build a four-line record
Capture the agreed action, the owner, the confirmed window and the message that established it. “Collect the table; Jo; Sunday after noon; seller's reply accepting Sunday” is enough to act on. If the reply adds “call before setting off,” include that instruction rather than burying it in the thread.
Keep a path for later changes
Give the household the current instruction and one person to monitor the seller’s replies. If the seller proposes another time, update the status to pending until it is accepted. Leave unrelated names, order details and private discussion in the original thread instead of forwarding it wholesale.