Adopting a family member?

Michelle
Has anyone ever adopted a family members child? I have two cousins that are both pregnant for the 3rd time each. Both lost both their children before at a year old and a newborn. Both are homeless and on drugs. I have a older family member (45) that adopt the 1 year old 10 years ago. I was wanting to see if anyone has gone through that process? Me and my husband are young but have degrees and great jobs.