Can one child have 2 biological fathers?
Superfecundation is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse, which can lead to twin babies from two separate biological fathers. The term superfecundation is derived from fecund, meaning the ability to produce offspring.
On a relatively basic level, artificial insemination and surrogacy result in an offspring with two genetic parents, but with a third parent as the mother carrying the child. In more extreme cases, it is possible for a child to be created with three genetic parents.
Chimerism is a rare congenital condition involving one person having two different sets of DNA. There are a few instances when it can occur: when a fetus absorbs a vanishing twin during pregnancy, when fraternal twins trade chromosomes with each other in utero, or when someone has a bone marrow transplant.
Traditionally, children have two parents, a mother and a father. More recently, courts have recognized that children can have two moms or two dads.
Recently, researchers with the Institute of Life in Athens, Greece, announced that a healthy baby boy was born who basically had the DNA from three people. The child was born to a 32-year-old woman who had failed in four cycles of in vitro fertilization (IVF).
This means the baby has three genetic parents: the father who supplied the sperm, the mother who supplied both womb and the egg nucleus, and an anonymous donor who supplied healthy mitochondria. Of these, the mitochondrial DNA is by far the smallest contribution.
Some kids live with two moms or two dads. Why? Because some people have romantic feelings for someone who is the same sex or gender. (Your sex or gender means whether you are a boy or a girl.)
It has been shown that newborns may resemble a mother's previous sexual partner, after scientists at the University of South Wales observed an instance of telegony – physical traits of previous sexual partners being passed down to future children.
If one egg is fertilised by two sperm, it results in three sets of chromosomes, rather than the standard two - one from the mother and two from the father. And, according to researchers, three sets of chromosomes are "typically incompatible with life and embryos do not usually survive".
Each mature egg and sperm then has its own specific combination of genes—which means offspring will inherit a slightly different set of DNA from each parent. “It's just a matter of biology,” says Megan Dennis, who studies human genetics at the University of California, Davis.
How many children have a different biological father?
These numbers suggest that the widely quoted and unsubstantiated figure of 10% of non-paternal events is an overestimate. However, in studies that solely looked at couples who obtained paternity testing because paternity was being disputed, there are higher levels: an incidence of 17% to 33% (median of 26.9%).
A DNA paternity test is nearly 100% accurate at determining whether a man is another person's biological father. DNA tests can use cheek swabs or blood tests. You must have the test done in a medical setting if you need results for legal reasons. Prenatal paternity tests can determine fatherhood during pregnancy.

Valentina Vassilyev and her husband Feodor Vassilyev are alleged to hold the record for the most children a couple has produced. She gave birth to a total of 69 children – sixteen pairs of twins, seven sets of triplets and four sets of quadruplets – between 1725 and 1765, a total of 27 births.
The risk for passing down a genetic disease is much higher for siblings than first cousins. To be more specific, two siblings who have kids together have a higher chance of passing on a recessive disease to their kids.
Although this is quite rare it can happen and it's called superfetation. Two babies are conceived from separate acts in two different cycles. These babies can be from the same father or two different men. When heteropaternal superfecundation occurs, the babies are from different fathers.
Most children of two moms use variations of the word “Mom,” but I've known some who call both parents by their first names and others who call both of them “Mom.” I personally call my moms “Mommy” and “Mama” because that's what they chose for themselves before I was born — and I've kept calling them those names for no ...
Having two babies in the same calendar year is rare, and the colloquial term for it is “Irish twins.”
What is this? A female dog can have as many different fathers for her puppies that bred with her. Dogs can release multiple eggs and they can be fertilized by whichever dog's semen is present. If more than one male bred her, that's how many fathers the puppies can have.
If a man had a monogamous relationship he could potentially father one child per year if his mate was willing, but it is not healthy for her to have them so close together. Waiting 2–3 years between births is better. After 3 or 4 births, chances of complications go up and rise with each birth after.