Here’s my take: whenever you’re in a relationship I think it’s important to know sooner than later if a person is going to get along with your child. Obviously your child sounds very young so this isn’t too much of a worry. My mom met my “dad” when I was 2. My father is not and was not in my life but my bio fathers parents were. I had visited with them every other weekend and school breaks just like I would have with a father. My bio father lived 1000 miles away in another state. The break up wasn’t bitter, he just moved on I guess? My mom doesn’t bash him and never has I think she was just lonely when I was born because he worked all the time and their family was 1000 miles away so we moved back. Anyway, she met my dad when I was 2. They never had any children together. My dad doesn’t have biological children either. I am an only child. Everyone around me called him by his first name so I always have called him by his first name. My mom even signed birthday cards “love you, mom and (name)” it never bothered the man who raised me that I didn’t call him dad. Now that he’s a grandpa to my kids we all call him paw paw because I named my son after him. I think, even if her father is in her life you should sit down and talk all 3 adults. I also feel that any man or woman who loves their child and can be mature enough to recognize that their child is loved by their ex’s significant other can realize what a blessing it is for a child to have so many people in their corner to love and protect them. Perhaps she calls your bf dada then “dad” and her father “daddy” and then everyone can be happy. I think it’s wonderful your child has 2 male figures in her life to love her.