Adoption is great, I never had children myself (never wanted any), but my siblings both adopted children. Two internationally (and the whole family was at the airport to greet them when they arrived as infants, they are a few years apart in age), one was adopted through the Foster Care system.
Best nieces and nephew on the planet, they are great kids (lol, actually they are now adults, but to me, will always be kids).
One of my siblings was able to have kids, so they have two biological and two adopted. We were all very lucky, we got more kids to love.