DH has 9yo DC who has a hobby. We have 3YO DC who also has a hobby.
Contact has changed slightly to accommodate DSC mums work but has meant DH will miss all of our DC classes to take his DC to their hobby. He was gutted that he was going to miss out of our DC, so I said we could alternate each week! DSC is basically a drop off and hang about for an hour - no involvement. Our DC hobby is very interactive and DH absolutely loves it. He does hobbies on school nights also with DSC.
However - DSC has kicked off at this suggestion. They are going through a bit of an attention phase which usually happens when something is going on at their other home so we do empathise. However, our DC would like their dad to come with them too.
Anyway - it was left that we will alternate. All I face now is that awkward journey with DSC where they wont want me there (we get on really well its lovely) but when they are in these phases they tend to only be happy when glued to Dad.
The natural answer would be to let DH take DSC every week, until the phase ends but this has currently been ongoing for 5 months - the mum and partner split often but this has been for a long time.
Its a hard toss between what's fair which I think i am constantly battling as SM.