I don’t think there’s anybadvantage to get his sister tested. Maybe getting another relative from the other side of the family, that way you may be able to identify what side of your family matches are based upon which relative they match.
Good idea ,but I don't know how I would approach them about doing a DNA test,as I don't really know them.
Have you gone about this before ? How did you do it?
Edit: from researching about DNA testing, I was told it was best to get more than one person to get a autDna test as the further back you go the less likely they carry DNA that relates them to a distant relative, but your chances increase as both their inherited DNA is different and likely one of them has still DNA that can match them to a distant relative.
For example a 4-5 time great grandfather being the last shared relative.
Am I right or is it worth the money for the small difference?
Also time isn't really on my side as my grandaunt
Isn't the healthiest right now.