Might be a numbers thing. Brings back sad memories of my 1st DD'S Christening. We decided to only invite our own Godparents, baby's Godparents, grandparents, our own siblings. Morning of Christening I was told none of in-laws coming as I hadn't invited the wider in-law family. It was a joint decision about numbers as Christening on the tug in harbour so small space.
Fortunately, I had a very good friend who rallied the friends group to make up the numbers.
Reason wider family weren't invited? Between us we had 70+ Aunts, uncles, cousins.
My wider family sent gifts, cards and good wishes, despite not being invited. Nothing at all from in-law side.
You'll be pleased to know that, although it took me a lot of years, I finally got myself out of the abusive marriage and have remarried a wonderful, caring man and am now very happy.