A close relative was adopted out of our family when her mother died suddenly. No drugs, no alcohol. Her Dad just couldn't cope with his grief, her and working, her mother had been a SAHM. They had 4 children and the three oldest went in and out of care, but weren't adopted, they youngest was only 2 years old and was adopted and had the best life. I remember seeing the yearly letters with photos and all the lovely things she did. I've met her since she turned 18 and she is very happy she was adopted, she has a relationship with her siblings since turning 18, as she was an only child in her adopted family.
A friend from college adopted a 3 year old after lots of trouble conceiving. She found the first year quite challenging, but the little girl has blossomed now she feels stable (she is at school now.) The main thing my friend said was that she found she had no down time, that it was constant. She said how she thought being parent was the rose tinted version not reality. The child had been given up at 6 months then they did foster to adopt, but she was fostered by others first, so lots of change for her in a short time. Becoming parents is a big shock for everyone, getting a 3 year even more !
I have two children, but I thought I would like to adopt before I had them. I don't think I could now because it turns out I am not patient enough for kids. But I also wouldn't have a third biological child. I would certainly consider fostering when my children are much older or left home.
If I hadn't had children I'd probably have adopted, but I don't think my DH would of been so keen as he wasn't bothered about having kids. So we prob would of had more dogs!