...and vice-versa.
My dd was 7 on Wednesday. She woke up excited about her presents and ds 4 was excited for her and enjoyed watching her open them.
Then they went to their dad's for tea as they do every Wed and dd got more presents as expected but so did ds. Dd got presents on ds's birthday also.
I personally feel that my dd's birthday is her day and ds is genuinely happy for her and doesn't need presents as well. And it does them good to understand that there are days when their sibling will be the center of attention.
There's nothing I can do about it as my ex never listens to me.