@user1499333856 - fair enough, I wouldn't send or involve her anymore. I still think it's a v Dutch thing to do, to send to your brother, but it's also very bitchy.
In your last post, you've said: "And it is an issue because I don't trust what she says about me, if she supports me as the mother around my kids when I'm not there."
I think you need to stop caring what she thinks. I had to go through this with my Dutch MIL and SIL, and it's worked wonders. They did it more when they thought I cared. Now DH won't communicate if anything critical is said. MIL would never say it to me but all sorts of comments were made when my DD was young. Really undermining and unhelpful because I couldn't trust if it was my DH's input I was discussing about something baby-related or if it was MIL through my DH (it was that bad). I stood my ground and didn't speak to them for 6 months and they apologised.
My SIL actually organised a photoshoot for DH, his DB and both of their children (so DB's DC and our DD). It was meant to be a sons and grandchildrens photoshoot for FIL and PIL's wall but my SIL got dressed up and tried to do it with her and DB, my DH and the grandchildren - excluding me because I was in the UK, oblivious. They had photos printed excluding me and gave them to ILs, and everything! My in laws declined the gift because of that, my DH had a go at her and it was all very messy, but I didn't get involved.
SIL/MIL also don't like it when we don't bring gifts for DNs but when we did last time about 2 months after sending birthday gifts (we received no thanks) we bought two small puzzles and SIL said "great, more gifts".
When DD was born, DH sent over newborn pictures and they spammed the What'sApp group with pictures of DNs doing bedtime stories.
It wasn't nice at the time but in hindsight is very funny and I don't take them seriously anymore. Please for your sanity, ignore them. Don't let them get to you. Lesson I had to learn.