Backstory . We have a large blended family. Been together a decade - married for 8 yrs.
DH has had ten years of family court for access. All kinds of nonsense including an attempt by his ex to move them to another country 3k miles away. DH has fought every attempt to thwart contact . culminating in Ex being sent to prison for a week for contempt following another attempt at refusing contact. Dcs utterly fed up of being used as Exocet missiles against their dad, voted with their feet and two eldest came to live with us permanently at 12/14.
So the set up is this. I have three. 22,19 (away at Uni) and a 15 yr old at home. DH has 19 (at Uni) and 17 here doing Alevels. Before the move in with us, all 4 came every other weekend and slept on sofa bed / whatever spare bed we had/ spare mattresses. Once they moved in permanently we converted the dining room (large room ) into a double room for DH's 2 boys. The youngest 2 still sleep on the sofa bed.
This is an extremely long-winded explanation of our domestic set up, because I know what nonsense goes on on these threads about bedrooms. I wanted to make it really clear that the dcs like being here. They LOVE being here. Youngest 2 have NEVER had their own room here - we don't have one to give them and cannot magic one up. They have a very large home with their own bedrooms at their mother's house. Their mothers house is their HOME , they VISIT us - and love to do so but I am not going to pretend it is their home . They are only here 4 days a month and their belongings aren't here. Their siblings do LIVE here (despite one being away at Uni).. so there it is.
The problem.. My Dd (15) is often away at a sleep over on either the Friday or Sat that the DSd are here.
If this is the case, I offer my DD's (15) room to my DSd. (With DD permission) . I do this because it's better than them sleeping in the sitting room. Every time I have done this my youngest DSd has been incredibly thoughtless in my DDs room. She has left it very untidy. Has used her make-up. This time, some expensive 'mac' makeup eye shadows have been mixed together. Fake Eyelashes have been lateen out of their box and just left on the carpet. Sweets in a special cookie jar (from her birthday) have been eaten. There is more but I won't go on.
So. What do I do . ? Have a word with her myself. (I would feel a bit u comfortable with this as I don't tend to get involved with any discipline of dsc) But we get on well and I've been her step mum since she was 3. Say nothing but no longer offer DDs room when she's out. ? (Seems very mean)
Ask DH to have 'a word' (not keen as DH is quite 'Disney' with the non resident dscs- typically scared that they won't want to come and visit if he tells them off !) I expect he will say DD shouldn't be so precious about her stuff... Ironically two youngest DSds are VERY proprietary about their belongings and will be quite physically unpleasant to each other if caught with the others 'stuff'.
Or say nothing. ?