To be a bit annoyed my trip has been hijacked?

[HardyPlumEagle]

I had a day out planned for Saturday, I was going to get up early and go, have a picnic for lunch and such. I was happy to go alone.

DS (young adult) asked if he could come along with me, of course I said. He often does.
Ds girlfriend then asked DS if she could also come as she has never been. Again no problem.

The issue is DS girlfriend works Friday night so she is not going to want to be up early and they have asked me to book a much later train not getting to the place till 2pm so she can sleep (which is fair enough) but I feel sidelined.
What was supposed to be a nice day out has turned into two hours at most.
It is quite a distance on multiple trains and DS is not confident with the journey alone or I would go and let them come later.

Aibu to be a bit pissed about this or should I just suck it up so as to be seen as welcoming to my ds girlfriend?
Also usually if I was going with just DS I would pay for his fare. Am I supposed to pay for GF too?
This is the first time I am dealing with girlfriends and such.
DS girlfriend did take out DS on a trip in their car for the day but my train fare will in effect triple.

Agreed, you wanted a day out not a half day.

I’ve voted you are being unreasonable as I think you should either tell them, no, you won’t be booking a later train, and that you’d rather go alone!

Nope. You’re looking at paying three times the original cost for a quarter of the planned day out.

You need to go at your original planned time and they can meet you there. If two young adults can't figure out how to take a train somewhere I would be seriously concerned about their life skills.

They're adults

This is daft. Just say the plan was to get the train at X time and you will be keeping to that. They are welcome to join you later but you are in no way required to fit round them.

Yes you are right to be pissed OFF. You could also get pissed on the train if you want to.

I'd get the earlier train and tell them they can join you on it or meet you later for lunch - I'd pay for the lunch, but not for the train tickets.

That way you get your full day out but you also get to spend some time with them, and you're being generous and providing the lunch - if the weather is good you can gets bread, cheese and salads at your destination and have a cheap and cheerful picnic.

Your son should be able to manage changing trains, he can always ask station staff if he can't work out connections on his phone.

It’s not up to them to tell you that you are creating stress for no reason. They are hijacking and ruining your day out.

Man up and tell them you’re getting the early train, ffs!

This!

With that attitude (creating stress indeed!!) they’d not be welcome to come at all, how rude. You need to stand your ground rather than silently fuming

I wouldn't be going anywhere with someone who told me I'm creating stress by inviting them out with me.

Well, if DS wants to travel with you, he'll have to take the earlier train, as that's the one you are taking.
His girlfriend can decide to also take the early train with the two of you, or the later train alone, and meet you there.

and this!

Why are you allowing them to tell you what is reasonable for your life, and how much to spend, and what to do, and when to do it? Who do they think they are? And how much of a lesser person do you think you are? Why are you tolerating them telling you that you're causing them stress for not giving them everything they want, when they want it?

Separately, no you don't pay for anyone who invites themselves along to something.

Yes, after that I’d be telling him “I’m leaving at 8am, fit in or fuck off”.

What a brat!

You need to tell DS “I am leaving at x time. If you and GF aren’t ready by then, you can meet me later or we can go together another time. “

This. What a bloody cheek!

When the girlfriend asked to come and changed the whole day out to suit her would have been the point I changed my mind!

But the OP sounds like she’s booking train tickets, so needs to have that conversation now.

If he’s old enough to have a girlfriend he’s old enough to navigate train journeys.

Just say no that doesn’t work for me. I’m going at (insert time that works for you)

up to you if you want to pay for the GF or not? Don’t offer and don’t assume that she presumes.

Nearly everyone has given you the same answer here, so why keep making excuses for DS, and just do it, or else suck it up and rant elsewhere…

YABU for agreeing then complaining after the fact. What do you mean you’ve “suggested”, you simply say “Oh sorry no, that won’t work for me. I’m leaving early to make the most of the day. Feel free to meet me later on though!” End of conversation.

Agree. Say no and they can join you later. Don't give in then become resentful. Your trip sounds lovely btw

Your son shouldn't be telling you how to feel and it is healthy for you both for you to say no to him. Tell him you are sticking to the original plan and will meet up with them later in the day.

For goodness sake op stop being such a wet lettuce!