My ex-husband recently had a daughter and I wonder if I'm being taken advantage of to take care of her?

Photo byMinnie ZhouonUnsplash

My husband and I have been caring for my ex-husband's 3-month-old daughter after he was involved in a domestic dispute with his current wife, whom we'll call Nancy, resulting in her being punched in the face and getting a black eye. Despite the tumultuous history between my ex-husband and I, we have a blended family and co-parent our two kids (18 and 14), while my husband and I have a 12-year-old child together. We spend holidays, weekends, and vacations together as a family. My ex-husband's behavior was one of the reasons I left him, and I assumed he had dealt with it too, until this incident with Nancy. She pressed charges, and he admitted to his actions, which led to CPS getting involved. When Nancy asked if we could care for the baby, we agreed, and my ex-husband and Nancy are allowed to see the baby under certain conditions.

While my ex-husband and the baby can be alone, Nancy can stay with the baby at our house, and when they visit together, a third party must be present. They visit on weekdays between 6-10 pm, which works well for us, but on weekends, they don't arrive until almost 8 pm, as they are busy with other activities like playing games with friends, grocery shopping, and cleaning their house. My sisters think I'm being taken advantage of and suggest that Nancy should just stay with us until the investigation is over.

Although I have no judgement for anyone, I'm beginning to feel exhausted and taken advantage of after two weekends of caring for a newborn after 15 years. Am I being taken advantage of here?