To be angry at my sister over text sent to our DF

[Icarriedawatermelon01]

Today is our DF birthday. I've been away with parents and my DS this weekend. Me and DM put up banners and watched him open cards. He didn't have a card from my Dsis. He received a text from her saying "happy birthday dad, I haven't got you anything yet as you're really hard to buy for". I stood in disbelief she had said this. He was really upset but made out he was ok. Later my DM told me he said I wouldn't have minded if I just had a voucher or even just a card. It's the thought. I feel really sorry for him. I've tried to make a fuss for him today.
My DM text Dsis and said it would have been nice if you just got him a card. Her reply was well he shouldn't be so tough to buy for then, pretty much blaming DF.
I haven't said anything to her and stayed out of it but AIBU to think she's out or order?
For context she was invited along to this weekend away but she declined.

My dad didn't throw a strop, he just went a little quiet. He didn't make a song and dance about it. He doesn't expect a present but just some thought to show she cares. Not hard really is it.

I don't do cards. Massive waste of energy, time, money and resources imo. When I receive them, I open them and then pop them in the recycling. Equally, I don't send them.

An emailed amazon voucher is my standard go to.

Totally agree with you OP. If my DCs (now adult) forgot my husband's birthday or something, he would not make a fuss, but he would be a bit disapointed inside, even if he didn't show it.

And I would be cross with them. It's only one day a year!

Oops, pressed send too soon.

If I can't think of something.

Your sister does sound hapless and I would maybe drop a hint like 'not even an IOU for a nice meal/trip to the cinema?'.

I also don't enter into any conversation with my mum and dad that directly or indirectly criticises my brother. That's setting up a dynamic that I don't want to be draw into and it's not fair . Adults should negotiate their own relationships with their parents

... and children