I have come to realise recently that we tend to talk about the mental load as being the organising and planning and thinking and noticing and it absolutely is all of that.
But the bit that I'm finding the most frustrating is the need to accommodate and bring Dh along. To think about what he's doing and how to fit that into whatever I'm thinking about and then, and this is the most annoying part, to COMMUNICATE.
Case in point - every year DD's school has a day in summer where parents are invited to come after school and look at the classrooms etc. Any children who have been part of performance clubs over the year get a chance to do their performance, often for parents/grandparents who weren't able to attend the original due to numbers or whatever. DH has done this event at least 6 times. He gets all the same communication from the school that I do. He has the same conversations with DD and her performance that I do. He does school run 7 out of the 10 runs we do a week. And yet, I've just had to talk him through what is needed, what he will have to do, the timing etc.
I just want to scream.