[mom/step-mom]

My husband has custody of his almost 5yr old daughter with biom having supervised visits, but biom never visits. I have been the only mommy sd has even known. Her biom has been in and out of jail for the past 3 years. biom hasn't called in over a year. My sd hasn't seen biom since just befor she turned 2. I have 2 children from a previous relationship, but I would love to be able to adopt my sd. How do we begin? Does it matter how long my husband and I have been married? We have been together for 3 yrs, but married for less than a month. Biom has 2 older girls who live with their father also. They come to visit sd at our house so the girls can still know their sister. I would be so greatful for any advise. Thanks! P.S. every time I type birthmom together it shows as **. What is the lingo here? Thanks again!!