wow- just caught up with the thread. Some useful replies on here- thank you but also some really shitty and misinformed ones about MH
To set the record straight on the MH stuff- no depression and anxiety in an 8 year old are not necessarily situational. There are many reasons for MH problems (the thinking now is that clinical depression which is often genetic has its roots in early childhood. But that's another for another post and he is currently being assessed for various other systemic conditions that can cause or exacerbate this.) It is a HUGE struggle for him and the whole family, and uninformed parent blaming is not helpful. I have no problem with those answering my OP and saying that IABU about the getting a present thing of course, (many helpful and reasonable posts on here saying exactly that) but not extrapolating that I am to blame for his mental health problems because of it. this is a huge leap and an offensive one. Yes, parenting has a role in MH for sure. But MH problems are also an illness. To jump to the conclusion that his MH issues are my fault with no further information or context is more damaging than those posting probably realise and spreads harmful misconceptions about MH.
As for the presents on each others' birthdays thing. They chose to do this, and buy the presents for each other from their pocket money (we don't buy these gifts.) They get excited to do this and I think it is sweet.
In normal life I definitely don't favour DS1- I try very hard to give them equal time and attention. We also have a 17 month old though (and a lot of DS1's problems started after he was born) so they both probably get less attention than they should which is a bigger issue.
At the moment it is very hard to do the 'take DS1 out on his own' thing- my husband travels a lot with work, so am on my own with the 3 kids a lot of the time and we have no family around here for support and no friends that we can really ask for this type of help unless in an emergency. DS2 will be able to go out in a few days again, but still will be extremely hard to get him to sit and colour on the bench at the park (he is a very physical kid and will make a beeline straight for the climbing frame etc)
As for the substance of my question- thanks to those that have posted. i am thinking hard about this and whether this is the time in DS1's life to make this point or whether as some posters have said- a token gift to acknowledge that he has been ill too and this is also hard on him would avoid exacerbating an already difficult dynamic. I can honestly see both sides.