I am in my second marriage.  I have a 7 year old and 4 year old from first marriage.  My husband has a 20 yo, 17 yo, and 15 yo from first marriage.  We have married a little over a year.  His 20 yo daughter chose to live with her mother.  His 17 yo son and 15 yo son live with us most of the week, as do my children.