Depends on their relationship with their mom. Guessing if they don't know that it isn't good. Also depends on how they would react to that news

I would tell them that someone told you she was getting married. (So that if it does happen, they will not be shocked)

As for the pregnancy, I assume the consequences of that will eventually come to light, and I would deal with that as your kids learn about it.

My reasoning is that you don't want to come across to your kids as a gossiper or as someone who is bad-mouthing their mother.

That’s a tough one. If it’s 100% for certain, I’d tell them. If you still need to confirm the truth of it, I’d wait.

I grew up with a lot of hard truths. Some were hidden from me, some were revealed when I was ‘old enough to handle it’….I’ve come to learn that when we just explain things naturally early on, it’s much easier to handle than to present it as some big dark secret later on, or a surprise. No one wants surprised with that sort of stuff.

Best wishes

I am glad the kids have you. They are so young and may have trouble understanding it. Let her be the bad guy( which she already has proven she is) Let them find out from someone else because they are so young. God bless you all.

Just what @DrWatson says.

please stay out of it. your intentions will be misunderstood. let her be the bad guy

@Cigarguy101 i would find how true what your source has told you first . if it is right well i think they they are entitled too know about it . a thing i am wondering why has she kept this secret from her own kids and not invited them to the wedding . they may be thrilled to hear they are going too have another sibling a little brother or sister

@Cigarguy101 no maybe not but how do you think the kids might feel when they find out. i know it is a difficult call and i am not been critical of your decision you are right it is far from easy

if your on speaking terms ask if her she is letting them know, are they invited, (they may have been invited and don't want too uset you),

I would wait until you have further information. No need to upset your kids if they are distant from her.

@Cigarguy101 no wrong answer but how would the children benefit from accruing that information?

No.
What good does it do them to know ?
Besides it's not your news to give.

I would let her tell them, and if she doesnt...... well, then they werent meant to know.

I wouldn't, not if she abandoned them like you've said

Let their mother inform the kids if she wants.

It is mom's responsibility to tell them.

No, they will find out on their own

Let them enjoy the new home.

Oh dear

Yes