Dealing with my kids

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Updated on Jun 20, 2017
I have three kids; a girl & two boys. Shortly after I had the third baby last year April, my husband's neice(12yrs) & nephew(10yrs) came to live with us. I am confused right now, I need to give my kids all the love & attention but the older ones are not cooperating. They already know I am not their mum & every effort to love them proves abortive. They are harsh on my kids & it's obvious they don't like the idea of them living with us. What do I do?