Sounds like you stepped foot into your first significant challenge, after recovering a bit of peace and compassion outside of the house. No doubt about it, questionable behaviour can lead to triggering a lot of questions.
I imagine you're going to face some more questionable behaviour before the week's out. Being a mum to a 14yo boy and a 17yo girl, we've shared a lot of ups and downs in fine tuning our relationships in raising each other.
Not sure if this will change things but question just about everything questionable, out of sheer curiosity. Do not settle, under any circumstances, for 'I don't know' as an answer. Manipulate an answer out of them, carefully (not aggressively). It's an art form my daughter's led me to mastering. I admit, she's been a star in raising my consciousness over the years. She'd rarely settle for 'I don't know' out of me as an answer or 'Because I said so'. Had a heck of a lot of revelations over time, including much of what I'd say to her being based on what I was taught as a kid. Of course, we're taught to stop questioning our parents, even when they've got no good reason. A lot of it's tradition, based on how they're taught. A lot is highly questionable. Then you get a challenging curious little offspring who demands answers.
I try to be conscious of reasoning with my kids. They're rarely left to wonder about my reasons. They are also very reasonable people. Some of the time we'll even reason our way through to negotiation, a compromise. It's a bit weird, hey, how we're never really taught the skill of reasoning as kids.
So, 'Hey kids, why did you not think to prepare the house for me on my return?' Answer may be 'I don't know'. Your response 'Not good enough, I want you to think about why you didn't and then tell me the reason'. You're asking them to be reason able. Perhaps the answer is simply 'We were thoughtless. We didn't think (beyond ourselves)'. You, 'How do you think you could be more thoughtful now that I'm back?' Remember, don't settle for 'I don't know'. Running you a bubble bath would be super thoughtful.
Be prepared to be challenged by them too. 'Mum, why can't I do this or go there?' You'd better have a good reason, one they can relate to otherwise they're going to say 'That's not good enough'. Works both ways :) Makes for a mutually respectful relationship.
So, any questionable behaviour, question it. Any unreasonable behaviour, calmly demand a reason for it. Easier said than done, I know :)