So many people pass over the older children - that is awesome the you are willing to do this!! My neighbor had two older step-children and adopted a brother/sister that were 3 and 6, I believe (maybe 1 year younger..?). They have adjusted well and she is one of the best moms I know. The kids call her mom and are very good friends with my kids. There are always challenges being a mom even if they are your own, as you know - and it will have it's trials, but it will also be rewarding and they will be better off having you for a mom. The other kids are old enough to help out and know what's going on, but just make sure they are on the same page as you are and explain how it's going to work out - especially for the 12 year old. Also - not sure if this counts, but I have 2 step-children myself, but full-time. I cannot adopt them because their mom is still kind of in the picture, even though she only spends a few hours a year with them, but I consider them mine any way. I have known them since they were 3 and 6 - then married their father when they were 5 and 8 (3 years ago). They had some adjustments moving in with me because they were older and had gotten used to certain ways, but 3 years later we are doing fine....DSS is in counseling for some emotional issues, but he is a great student and responsible, etc. They call me by my first name, but refer to me as 'Mom' to others. I am about to have a baby, so it is opposite of you having your bio-kids first, but I'm sure we will all adjust well given time. And the great thing is, when you adopt, they will call you Mom!! As long as you are willing to go the distance with them, it will work out. Good luck!!