My husband and I have a child together who is 2 years old. Our daughter refers to our bf/gf as aunt and uncle. They were our good friends before we decided to have a poly relationship, so the aunt and uncle just stuck. They will occasionally watch her and help keep her out of trouble. But, as far as the regular parenting things go it's on my husband and I. They are currently pregnant and I'm going to assume it will be the same way when they have their child.
We have been living together for about a month.