Fits right in

When your parents are divorced things aren't the greatest and things don't always work out. But when one parent gets a boyfriend or girlfriend (in this case girlfriend) it's work out perfectly. Meeting her whole family, spending days with them and going to dinners it feels like they have always been part of your family. Having kids that all get along in many different age groups, never running out of things to say or do and hanging out, playing or sleeping is fun. 

Just because they're aren't your family by blood, they are still family by heart. They will not try to replace your family or anything and they can't because nothing can. All they want is to be part of your life and join your current family.