My mother isn’t the harridan I have painted her but naturally wanted her whole family there.
and there it is......you don't get it, do you?
It's not up to your mother, you or anyone else to dictate who is invited or what sort of wedding it is, it's up to the bride and groom - poor bride, having people forced on her at her wedding that she didn't want to invite. No children is not everyone's choice at a wedding, but it was theirs, and you and your mum thought it was OK to over ride that, nice.
It doesn't matter who you invited to your wedding, you had your day, they don't have to do the same.
Maybe think about how family relationships will be in the future, especially if they have children, that's more important than sulking about the wedding.
I'm not surprised your husband was annoyed, I assume he would either have preferred to leave the children at home with a baby sitter or stay home and look after them himself.
Your only response to an invitation should be to either graciously accept it or politely decline it - not try to change the terms and conditions to suit your preferences.