I have a 10 yr DD and an 11 yr DSD.
The shower thing is a bit odd at her age, most girls around 10+ start wanting privacy and are becoming aware of their changing bodies. She’ll be in her last year of primary school when she goes back in September won’t she?
The minecraft / tv obsession is totally normal. It’s annoying I agree but most kids of that age are the same with gaming or YouTube or certain tv programmes.
The demanding to get things is rude but again it’s typical kids testing their boundaries... it’s how your react that is key. If either of my girls said “get me an ice lolly” I would probably reply something like
“Firstly you lost your manners there, I’m not your maid. Secondly unless your legs magically broke when you sat down then you can get one yourself, you know where they are”.
If they ask politely I have no problem getting them a drink or snack whilst they’re relaxing.
Interrupting conversations at 10 is also indicative of a lack of manners, she’s not a small kid lacking impulse control and she needs pulling up on it. I would tolerate that from my girls.
They would firmly be told that we’re having an adult conversation and they can wait a few minutes.
The scissors thing is disturbing to be honest and not a normal thing to say.
To be honest, don’t take this the wrong way but you are not a parent and often the people who think they have the best ideas about parenting aren’t one themselves.
You have different ideas on how to raise this child but unless you and your partner agree to some ground rules regarding manners then it’ll never work.
It sounds like the damage has been done though... you don’t seem to like your SD very much and kids are more astute than we give them credit for. She will know she’s annoying you.
You’re either going to have to talk honestly to your partner and try and learn and ask for her help dealing with these issues you have, or you need to walk away.
I’ll be honest, I love my SDs but my relationship with my partner wouldn’t work if they lived with us full time.
We’ve talked about what would happen if something happened to their mum and they needed to live with their dad full time... I was honest and said I couldn’t do it. In that scenario we would sell our home and buy 2 smaller houses and live separately until such a time that my SDs were more independent.
Luckily they’re a bit older now (16 & 12) so I think we’d actually be ok. But being a full time stepparent must be really hard.