So I have been with my common law husband for 13 years. When I met him his kids were small. 2 girls.. now aged 22 and 20. 
When they were growing up( which actually hasn't happened, they are both like 8 year olds) we had them half of the week. Now they are here ALL of the time! Which, I did not sign up for. They are both princesses and I would not be sad if I never saw them again.