DH daughter has announced her pregnancy

Jealousies can spring up in families, blended or not. Every new baby can put another child's neck out of joint. You just have to tread extra carefully Farmersdaughter to make sure your DD doesn't feel abandoned and make it up to those DGC yourself.
I don't think you ABU at all but you will have to stand up to any obvious unfairness.

‘Blended families’ eh? Not easy to navigate sometimes.
This family dynamic has tensions within it by the sounds.

I see what you mean about the remark your DH made but he may well just have been overwhelmed by the good news. He would naturally feel excited.

As far as the money spent is concerned, I agree with you. More has been spent on your stepdaughter although I, like JaneJudge wonder if your daughter's father contributed to the wedding and items for the grandchildren.

It's hard to make things exactly fair. Does your DH feel guilty in some way about perhaps having left his children or first wife? That could make him want to spend money on his daughter.

Do you feel closer to your daughter than your step daughter?

He quite naturally feels closer to his daughter. Do not spoil a very happy time for them.

Not such a good man after all then.

Did your daughter's Father contribute to the wedding etc?

Oh dear.
I don’t think this is going to end well.

Maybe I am being unreasonable however I fear what may come for the other two I would hate for them to be pushed aside since they do dearly love him but he's constantly favoured his daughter in every situation. When my DD got married we had a budget she was given towards said wedding since there would be at some point another wedding to make it fair. Great. Two years later DSD married I expected same would happen with perhaps an increase of a couple of hundred pounds to take into account rise in prices. No the budget was given plus 2 thousand towards honeymoon the dress bought cars and bridesmaid dresses paid for! When I questioned this I was accused of being mean and was told basically to butt out of his relationship with his DD. I for a quiet life let it go. It was money we had both saved as we both still work. He's already told her were buying the nursery set and pram. When I suggested buying a pram for eldest grandchild it was shot down and she was bought a Moses basket. Now can you see where I'm coming from.

He was perhaps a little crass but I’m sure it wasn’t unkindly meant.

I think its normal for him to be excited.Unless he was there when your children were growing up he may not be able to see their children as GC in the same way as seeing a wee face that looks like his child did when she was wee.
Surely its human nature to look for the familiar in a baby and much as he cares about the two already here THIS one will bring back memories by the bucketload for him ,be happy for him he has supported you with your grandchildren

but they aren't his, are they.
he is just stating a fact.
it's you that's making it into something negative.

I don’t think he meant it the way you think. I agree with Ilovecheese .....I think he was thrilled for them, not for himself. Don’t be upset, although I can understand how you feel.

I think MOnica put it well. I can understand his delight and also understand your feelings but please just be pleased for him and forget the upset you felt.

I think you are being unreasonable.

It is a bit insensitive but maybe he just didn't think before he opened his mouth, we all do it sometimes.

My guess would be that he's just happy that the 'bloodline' will continue. I don't imagine, if he is a good man, that it means he loves his other Grandchildren any less. I have both a GD and two step GD's, I honestly adore them all.

Did he perhaps mean that they had been trying for some time and was thrilled for them rather than himself?
I can understand your hurt.

Please do not read too much into it. Has he ever seemed a bad grandfather to your 2? Let him enjoy the moment. Do not let this happy time be tainted by black thoughts.

But I would not be best pleased at them rolling up during a lockdown.

Of course he sees them as his own, but this one coming is blood of his blood. You have had that for all the existing grandchildren. He has been delighted by them and loves them, but it natural instinct to want to see the children of your children.

Imagine that all the grandchildren born so far were born to your DH's children, wouldn't you long for one of your children to add to the number?