Your going to be a step-mom to four girls. OMG Good Luck. Girls are a hormonally challenging bunch. If you need any help or advice you'll find it here.
When xjw_b12 and I got married I had a five year old daughter from my first marriage. Xjw adopted her within the first five months of our marriage. Treated her like his own and proved that when our daughter and son came a little later in our marriage. While she was growing up we did go through a lot of the usual problems and yes she would through it up in our face the usual "he's not my real dad". But now she is 24, living away from home, working at a career she loves and when the going gets tough for her she calls xjw for the over the phone line daddy hug, and will say to him "I love you dad." That makes it all worth while.
take care.
love
cj