Am I in the wrong

I would be most upset too, especially when both of your parents died so recently.
But (sorry!) this is a very common situation in a second marriage, with step children etc. Perhaps your husband's son contacted him to ask about the inheritance? Husband is drawn into divided loyalties.
He still should have put his promise to you first though.

This happened this morning and because I told him it was none of their business although not so nicely! he has stopped speaking to me. He is blaming me so I thought I would ask for your opinions. Just to make sure it was not me as I am still grieving lost both parents within a year.

I would be livid. I have the same problem with my MiL. OH once applied for a job that needed us to be married. At the time we weren't, as I was still once bitten, twice shy. The job was very near to my inlaws. I told them repeatedly that they had to say that we were married, if they ever met the employers.

We did marry very quietly very soon after, because I hated the lies so gave in - first thing my MiL did was tell the wife that we had just got married when she met her at a dinner! I was so angry, and she couldn't understand why.

No, you have every right to be angry.

So would I. It is a betrayal of confidence.If he can't see this, then I would keep very quiet about any private matters in the future.

Me too

I would be very angry as well Sixtynotout.

To be honest sixty when I read the OP I was surprised at the strength of my own reaction; in your shoes I would have felt betrayed. My husband and I discuss things all the time and we both seem to 'know' when the other wouldn't like our discussions to be talked about generally, but if either of us expressly asked the other to refrain from airing something publicly I would feel really let down if he then went ahead and did so. I agree that it's worse if he doesn't see that you had drawn a boundary and he willfully crossed it. for you.

Thank you he made me think it was me who was at fault he cannot see he has done anything wrong which is worse really. He wants to visit them soon but I feel like I cannot do it now. I don't trust what he will say next.

I would feel extremely annoyed sixtynotout - how on earth did he try to justify going against your express wishes? I think I would have to withhold any further information and tell him that it's because he can't be trusted.

No it is not the first time because when his daughter in law asked how I was a couple of weeks ago. Instead of saying how I was emotionally he just went into details of my family business. After this I said I did not want it discussing again. He knew how I felt. It is my brother that concerns me because my husbands son is no relation to him and therefore I feel my brother will be annoyed if he knew.

Personally I would be annoyed. If someone tells me to keep something confidential, I do, even when I am bursting to tell. I expect others to do the same. Sadly, some people can't. I'm sure he did it in all innocence sixty.

I think you have every right to be annoyed with him, if you had specifically asked him not to discuss the matter with anyone else.

No rockgran I had said at this time until things sorted because he is not my son and does not live nearby. I wanted things kept private.

Perhaps he thought you meant don't discuss it outside the family.