My DSC children get £100 each from their dad, my DH (plus obviously presents from their mum and all her family etc)
Our DS who is 3, I spend maybe £150 on him.
DH pays for the DSC (4 of them so £400) and then I do DS, it's easier that way and works best for us.
They also get £100 each from MIL and £50 each from DH's Nan, so spoilt rotten.
Sometimes they lump it all together if there is a big ticket item them want.
(And I do not feel guilty that DS gets a little bit extra as DSC get much more from their mum and her side. They are old enough to understand why and tbh, wouldn't have a clue as they are so happy with the mountain of stuff they have got that they don't pay much attention to his things anyway!)