I'd suggest you collectively need to do some rearranging of boundaries for the household.
You're four(?) adults living together. Your son and his girlfriend would probably much prefer to be living independently rather than with you. So you need to attempt to do some breaking of the parent/child model of interacting you've had till now.
Housework needs sharing out in a fair way, with a level of tolerance for people doing different tasks in different ways.
Last minute quasi-demands for help that are time critical [like lifts from the train station] should be minimised. What would your response have been if your son had said 'no, I can't pick you up, I've had x to drink' or some other outright 'no'? It is worth treating the vagueness as a 'no' - allows you time to find a taxi etc so you're not stuck waiting for him to make a decision.
I can't think of many more immediately irritating things that being asked with 3-4 hours notice to go out to collect somebody in a non-emergency, especially if I was tired enough to actually want to go to bed. I'd probably do it, but begrudgingly.
There are lots of potential solutions:
- a train station collection rota, so you know in advance if it's your turn to collect anyone who is out
- asking a few days in advance to let people plan if you want a lift
- the person going out takes a car to the train station and that car is unavailable to everyone else whilst they're out (or somebody can have the car on condition they collect the person who is out)
Everybody needs space and privacy, including from personal questions and around their things. Is his girlfriend happy with you doing her washing? Is everybody 'allowed' to use the washing machine? Does he wear clothes that he thinks need ironing? [another possibly irritating thing: somebody else doing ironing for you, of clothes that don't need ironing, and expecting you to be grateful for it]
Energy saving / water saving wise, full loads in the washing machine are preferable, so makes most sense if everybody washes everything that's in a laundry basket / knows to add some tea towels/table cloths etc to fill the machine [yes, this is still a point, even though each of you you might not want everybody else washing your underwear].