to think SO’s brother is ungrateful?

[amarantha]

So long story short I have a bit of a flirtatious history with SO’s half brother. SO knows about it and accepts that I try to be nice to him even though he thinks I shouldn’t be.
SO and I actually got together when, whilst flirting with me, his brother started parading his GF around who he’d moved into his house out of nowhere (turns out he’d got her pregnant).
I’ve not met this GF (we’ve been in the same place but not introduced) and SO’s brother won’t speak to me in front of her and doesn’t mention her if she’s not there, but in an attempt to be civil I bought gifts for them as a couple and one each (after all it is the brother and girlfriend of the guy I’m seeing and I got gifts for his mum and dad because I like to be considerate). I’ve not had a thank you or anything from either of them despite seeing them in person and him having my number. This has really upset me as I put thought into the gifts, while it’s not about money I spent £50 on the pair of them and would have liked to know if they liked them.
AIBU to think they’re just horrible ungrateful people? I’ve done things for the brother to help him out in the past that he’s not said thank you for and it’s really started to grate. I’m also considering not doing anything when the baby is born but feel guilty that I think this, would IBU to not say anything or acknowledge the birth at all?

Well I guess he's not as comfortable with your shared past as you are.

Yes ywbu to not acknowledge the birth. I think it's an awkward situation all round so just be the bigger person. If after the birth they are still twats you then can ignore them.

I have never bought present for a random boyfriends brother, let alone a boyfriends brother I used to flirt with, bur seriously... you bought a present random boyfriends brother whom you used to flirt with's girlfriend whom you haven't met???!!

And you think THEY'RE odd for not thanking you?

They've been too busy discussing how to respond to your odd present buying spree.

Gosh !

It probably feels a bit strange to them that you went on to date his B. All a bit close to home.

Also if he's not thanked you for anything in the past they are not going to thank you now.

Was it Christmas gifts ? It's a long time to be thinking about it if it was.

I would just buy a token for the baby.

Surely it's up to your SO to buy presents (or not) for his family?

Not sure why you bought them presents? From your post, there's not actually anything between you and the brother apart from the fact that he is the brother if your SO, and you spoke to him before e got together with his gf. Neither of them seem to pay much attention to you. It sounds as if you think there's more to your relationship than he does.

Yes they were Xmas gifts. I get that it might seem strange but as I thought we were friends I was trying to be nice (one of the gifts was a baby book and for her I got pamper bits, him I got some chocolate and stuff). SO knew exactly what I’d given and helped me wrap it.
It got dragged up after SO got a phone call calling him useless for not being able to lend him money.

I'm ever so sorry but I read the op in the style of Vicky Pollard .