This is a question genealogists are frequently asked and the answer is usually “yes”.  There’s several reasons for this:

• Most people’s expertise improves as they progress with their tree, so going back over your work gives you the opportunity to fact-check your earlier work and ensure it is correct.
• It gives you the opportunity to find new information as new records are being digitized all the time and new records are being added to libraries on a regular basis.
• Checking all certificates previously received may uncover a small piece of information not previously noticed, or the context wasn’t recognised at the time so may provide additional information about a person or might help with a brick wall.
• It refreshes your memory which assists in thinking of alternative records that could be checked that weren’t previously considered, available, missed or overlooked.
• You may have come across name variations in later research that you hadn’t tried in your initial searches so you can broaden your search when re-examining your work.
• It gives you the opportunity to list sources for the information, often during early research, we don’t realise the importance of this. Listing sources allows us to check that information was from reliable places and if it wasn’t gives us the opportunity to check for more reliable sources to ensure the tree is correct.
• Ensure you have a combination of documents that link to each other as proof for the connection between generations and that you haven’t added any information to your tree of a similarly named person.

Some suggestions for re-examining your family tree:

• Work on one family line and one generation at a time in an organized way. Start with the most current generation and work back to earlier generations.
• Read the records out loud so your eyes aren’t just skimming over the information.
• Discuss the record or information with another interested family member, different people think different ways and they might pick up something that you didn’t.
• Check for new records for each person.
• If needed, contact a genealogist or record agent to interpret or re-examine information you have that confuses you, doesn’t appear conclusive or leaves some doubt. Paying for expertise gives a second set of eyes as well as professional knowledge.