To not tell my DCs this

[MiddleAgedandConfused]

Background - married my Uni boyfriend in my early twenties, divorced mid twenties - no kids together. Met current DH when I was about 30 and have been together 20 years; 2 DCs, 13 and 16. Family and a few old close friends know I am divorced, but I have no contact with anyone else from that time in my life. Haven't seen exDH for 25 years.
A close family member that I like and trust has told me that they think I should have told my DCs; they think that when the DCs find out I was married before they will be angry and resentful they had not been told earlier.
I have not taken a conscious decision to not tell them - I have never even really thought about it. DH and I have never discussed it. It is something I consider irrelevant - it happened years before they were born, before I met DH, so to me it just a non-story. But happy to tell them if it could be an issue.
AIBU not to say anything?
Or is the other person?

YANBU, but I'm surprised your kids don't think it's odd that there's this whole period of your life that they never see any photos from.

My DF met my DM while he was going out with her best friend (who is now my brother's godmother). It's really not some shameful little secret if you weren't living in pure and godly chastity until you fell instantly head over heels in love with your current DH.

Reading all your answers made me understand that the situation is more complicated than I thought. Bowlersarm's reply sums it up really well.

I dismiss it as irrelevant, but the DCs might not feel like that - and they might not even understand why they find it upsetting.

It had also not occurred to me that they might create their own back story as to why I had kept it a 'secret', which could only be worse than the truth.

So now I have to decide whether to tell the relative that I took their advice. I am concerned it may open the floodgates to a whole load more 'good' advice...

I'm glad you told them. Previous marriages maybe aren't "big" things, but a freshly discovered previous marriage that appears to have been kept secret deliberately is pretty much the stage for a live demonstration of "how to turn a small molehill into Mount Everest- now with audience participation!"

Thanks, op, for liking my post ! It is very difficult to explain, and I can't quite explain it properly. And it absolutlely need not be a big thing in the slightest for your dc, I just think its probably best that they know via you telling them.

Has your Dd mentioned it since you told her?

No, don't tell your relative, those are floodgates you don't want to be opening! If she brings it up again, just say ''the kids know, it's really not a big deal for any of us'

I glad that you are telling your dc. My father had been married before he met might mother and I didn't find out until I was 50 when it came as a shock. He had got married during the war just before he was going abroad with the army and when he came back they realised that they were not compatible.

I was upset because I wasn't sure if I had half siblings (I haven't) and I feel it would have been better if I had known before it came out in conversation so late in life.

Bowlersarm Only told her last night so she has not really had chance to ask me any more questions. She seemed fine, not upset at all. But we are quite a pragmatic family and she has never been a drama queen. So fingers crossed that's the end of it - for now at least.