Fellow mommies, does your child(ren) have a relationship with their bio father?

I haven't seen my son's father since I finally got rescued from him when I was 13 weeks pregnant. He's now over a year old, and I'm 100% happy with him having no relationship with his sperm donor. Moms who's kids have no relationship with the sperm donor, how did you explain it to your kid if/when they asked who/where their dad was? My son is obviously too young to know he's missing a parent, but I'm sure he'll ask about it when he's older. My first thought was to say he's dead, but I can't do that because it's not true, even though he's dead to us. Any advice is appreciated!

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