So DH never knew his father. he was under the impression that it was the man my MIL had been married to but was split up with at the time of his conception (well, not at the exact time eh 
). I've done DH's family tree on acnestry.com and from what I had seen his father was pretty English and had been for at least the few generations I went back.
I also looked up his mother's side both parents and found a reasonable amount on both of them as they have been mostly local for generations.
All English. And within a 100 mile radius for generations.
SO Dh did the DNA kit and came up as 40% Irish and The rest English and Scottish (with 7% Swedish for good measure)
I realise the DNA mapping is notoriously bad and they can't give you lots of info on it, however all of his closest matches are in NI, in fact they're all from the same town.
They range from 100 cm to 420cm.
I used the Leeds method to get four groupings which are supposed to correlate to each grandparent.
2 are definitely from the same area of Ireland. One is from where we expected it to be in England and the other Scotland/NI.
His grandparent had loads of siblings 10ish each. So there should be lots of people with his father or granddad's surname in his DNA matches right? He has none but we do find matches with maternal grandmother's maiden name.
So please can someone tell me if I am wildly off in thinking that his dad, and potentially also maternal grandfather are not who we think we they are? And if so, how do I find his father? I don't want to cause any issues by asking about the maternal grandfather as that is likely to cause hurt. My mil passed away and we can't ask her for any info. Her sibling was very confused and adamant that my dh's dad was who MIL had said it was and didn't know anything about any NI connections.