She's lucky she can do this, me and my brother had the same age gap but my mum was on her own. There was no separating us! We had to learn to get along/share. The blatant favouritism is so worrying.Of course 'the girl' is with her after they have divided and conquered the kids! How about be together as a family and teach them to treat each other kindly and get along??? She is just pandering to it all. You give the kids no choice, they be kind and respectful to each other or treats get taken away! Of course everyone separates the kids occasionally but she does it all the bloody time and shows blatant favouritism.