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Thank you for your reply.

Both the mother and father's people are from Scotland.  On the mother's side I have many matches and have been able to trace her family back several generations. 

Unfortunately, on the father's side there are only 5 matches between 92 cM and 391 cM, and two below 10 cM.  This includes the matches of matches and none of the matches on his side has a full tree.  In fact, only 1 had a tree - a very small  tree.  I contacted her, and although she hadn't done a any research and only wanted the ethnicity result, she was able to provide me with her parents, grandparents and great grandparent's names.  From there I was able to create a well-documented tree going back 6 generations.  I just have to figure out where my friend's grandfather fits in.  Therein lies the problem.

I feel like I have all the pieces to the puzzle, but don't know how to put them together.  I am trying to learn the basics of DNA and learn to use the tools as well.  These tools are helping me sort the pieces, but my brain just doesn't know how to put the puzzle together.

Neither my friend or I are young, and she would like her children and grandchildren to know their roots on her father's side.

Thank you for the replies.

I am now learning to use the tools on DNA Painter in hopes of zoning in on this man.  On the basis of the replies I've received here and what I can see from the tools I've used (as much as I can understand), it seems like I may have to go back a generation to find him.

This is a bit perplexing as this would give a minimum age difference of at least 30 years between my friend's  parents.  Of course this is not impossible, but seems unlikely.

At any rate, these replies have helped me to broaden my search

I'm a newbie at DNA and after receiving helpful responses to an earlier topic I posted, I uploaded DNA results to Gedmatch.  These results combined with additional research has helped me narrow down the biological grandfather of a friend I have been searching for.  I will label this suspected grandfather RW.

I have found that many of my friend's matches are related to both RW's parent's (PW & FD), with the majority of them being related to his mother (FD). 

I have ruled out RW's sons as being the bio grandfather because of age.  I have also found that none of FD's siblings were married to any of her husband's (PW) siblings.

I have received information about RW, FD, and PW from a DNA match that I believe is a 1st cousin 1x removed and DNA suggests this as the strongest possibility.  If this is the case, my friend's strongest match would be her half 1st cousin, also the strongest possibility according to the DNA results.  I will refer to this person as AW

The 1st cousin 1x removed confirmed that AW is also her cousin 1x removed and gave me his information.  His grandfather is RW

Am I corrected in thinking that my friend's bio grandfather has to be RW or one of his brothers?  If not, what other possibilities might there be?

Thanks for the replies.

Knowing that this is likely a 2nd cousin gives me a place to start.

I have contacted a couple of shared matches but have had no response.  This really isn't a surprise given the circumstances.  I'll continue looking into additional shared matches.

Also, I'll look into DNA Painter.

I know I'm in for a lot of work on this, but it will be worth it if it works out.  If it doesn't I'll have learned a thing or two along the way.

Thanks for the tips.