I am probably but need to vent so will take a flaming as my penance.
DC and I have birthdays close together. DM lives 20 minutes away but didnt visit until days later. She brought presents but all were from her 'present drawer' (stuff she buys and thinks 'that would make a nice little present for someone').
It's not the presents themselves, it's the lack of thought behind them.
The problem is that DC & my birthday are at the same time as my late DF's. I guess that for DM the proximity of the dates means that DC & my birthday get mixed up with her own grief.
DF died nearly 20 years ago and every year since it has been the same.
DM is better (though not great) at birthdays the rest of the year. Sadly DC and I cant move our birthdays to another time of year.