What is the maximum number of biological parents an organism can have?

We see a mom, dad, daughter and son playing in a living room. The dad is lying on the floor and playing "airplane" with his son, whose arms are outstretched.

Families come in all shapes and sizes, and not all parents are biologically related to their children. But most people do have two genetic parents, from whom they inherited their DNA. However, a very small number of people technically have three genetic parents, and depending on the definition of "parent," other organisms have many more than that.

So what's the maximum number of parents an organism can have? Some animals can have up to three genetic parents, plants can have at least three, and bacteria can have multitudes.