Talk maths for fun in the car and at dinner if you must. He's too young to do handwriting practice in my opinion, although writing lists for you at the weekend would be a good way to do a bit extra if you want to. so that just leaves piano. Little and every day is recommended, I know, but in our house every other day is an amazing achievement. He could just do that while you make tea. Job done.
I thought this was a wind up, but then I do know that if I don't plan then sometimes I realise we haven't done any of the things that we meant o get done this week. So in my head I have days allocated for hairwashing and for violin practice. But I think that is enough.
I can relate to the last paragraph especially with a large family, hence panicked phone call to tesco 7 a.m this morning trying to get hold of swimming trunks
However I would say that handwriting practice should kick in as soon as DC starts to write, which in this country is unfortunately at a very young age. Leave it too late and the bad habits picked up will never be corrected or not without a massive amount of time and effort. However I don't mean just copying out realms of letters and paragraphs but concentrating on a correct and relaxed pencil/ pen grip and this can be done whilst making beautiful patterns, colouring etc. Re letter formation get a stick and do it on a beach, in a muddy wood or use a flour recipe (someone help me with this one as I can"t locate it) that makes a thick liquid that you can draw patterns in. Wonderful fun for practicing to write. My big regret is not noticing the bad habits my own DC had picked up at school sadly and not getting it sorted.