Is this child abandonment
We live in Indiana. My fiancé has had physical custody of his two boys for almost 4 years now. The mother has a past history of drugs and has had cps involved due to her letting the youngest boy get out and roam the streets. She left after a few months of cps being involved. On and off for 2years she has been in and out of their lives.we can't trust her alone with the boys because she will be putting them in danger. (She has several times) She hasn't seen them in about a year now with no contact at all. We don't know where she lives either. She has supervised visitations but she doesn't even do that. My question is is this considered abandonment on her part. When we get married I would like to adopt them.