I am one of 6 children so I have lots of people to buy for. I treat each sibling as a unit ie sis, bil and dc and spend roughly the same on each. Within each unit I tried to spend a similar amount on each person.
Dh has a mum, sister and bil to buy for. He spends more on his mum and sister but less on bil. Although bil also gets gifts from our dc.
His mum and sis are obv buying for more people so I understand they will spend less but they spend significant ly more on dh than they do on me and dc.
I know it is there choice but I just feel that it is fairer to treat everyone equally. It is the way my family always do it especially my late mum who didn't spend vast amounts but always treated everyone equally.
So probably not aibu as I know I am but more interested in how other families do it.