My DD is 7 years old, her father and I split up when she was just 8 months old so she has never known us as a couple together.
When she was 3 I met my partner, it was the first man I had been with since splitting with DD's father as I spent my time being a single mum and looking after DD.
My partner did not meet DD for the first 10 months - we would just spend time together whilst DD was at her fathers house.
Long story short - When they did meet, all went well and when DD was 5 we moved in together as a family, a couple of months later I fell pregnant, had a daughter and DD1 without a doubt adores her little sister
The issue now is that for the last 6 months my DD1 has become very rude and unkind to my OH. He has had 'you're not my dad' shouted at him many times when he has asked her to do something or told her off for doing something she shouldn't.
I have spoken to my DD several times about the things she says and told her it is not acceptable and very disrespectful but within a few days she says something again.
Most recent we have had are - yesterday at tea time
OH (talking to me) - have you remembered I am away on Saturday evening?
DD - hahahaha!! Good. We don't want you in our family so go away forever!
This morning when OH was saying goodbye to leave for work -
DD - if the house was on fire I wouldn't rescue you.
I have spoken to her once again this morning, asked why she is saying these things and she said she doesn't know.
OH is understandably very upset about the way she has begun to treat him. He is amazing with her and always has been. He did himself wonder if it was to do with DD2 - but he has never treated DD1 differently after DD2 was born and has made an extra effort to show her how much he cares for her. I'm lost with what to do about it 