Adoption is a powerful concept. Unlike biological parenthood where you can give up your children or disown them, adoption is a different story. You make a legal adoption contract to ALWAYS be their parent and and fulfill all the requirements parenthood entails.
The Bible refers to God's love for us as for that of adopted children (Ephesians 1:5). Adoption is a big deal. It is for keeps.
Even before we adopted our daughter, I used the word "adopt" in my branding process.