I have two DD, 11 and 9. Live with their dad, home life is good, no arguing, shouting, money worries etc. both work full time. I work from home so there's no childcare and someone is always around to take and collect from school. DD9 is a clever girl. Doesn't struggle at school but recently at home she's turned into a horror.
I suppose she pushing the boundaries. She pushes back when asked to get in the shower, read, do her homework, tidy her room etc. She will find a reason not to do anything we ask. Like pretend to hurt herself and when we tell her she needs to do these things we get shouted at, told she hates us, that other DD is the favourite, we must hate her, we don't care.
Sometimes it seems like she deliberately does something to get told off and then losses the plot. She's also known to sabotage things. For example we only have one bathroom. Often she will be using the toilet and when we ask her to hurry up as someone else needs to use the shower etc and go out she will stay in there for 40mins so we can't use it in time.
Oldest DD didn't do this so I'm kind of at a loss how to handle this and what to do. We don't treat them differently at all. The only difference is DD11 is compliant and does everything she is asked so it may seem we don't tell her off.
I'm sure this is just an age thing but is there any tips on how we should handle this? Sorry it's so long.