What happens to kittens when the father is son of mother?

This situation describes inbreeding, which is the mating of closely related individuals. In the case you described, the father is the son of the mother, making them parent-offspring mating.

Here's what can happen to kittens in this scenario:

* Increased risk of genetic disorders: Inbreeding concentrates genes, making it more likely for offspring to inherit two copies of a recessive gene that causes a genetic disorder. This can lead to a variety of health problems, including:

* Physical abnormalities: Cleft palate, heart defects, skeletal deformities

* Immune deficiencies: Increased susceptibility to infections

* Behavioral problems: Aggression, anxiety

* Reduced fertility: Difficulty breeding and having healthy offspring

* Reduced genetic diversity: Inbreeding limits the range of genes present in a population, making it more vulnerable to diseases and environmental changes.

* Increased risk of stillbirths and infant mortality: Kittens from inbred parents may be more likely to be born dead or die shortly after birth.

It's important to note that the severity of these effects varies depending on the degree of relatedness between the parents and the specific genes involved.

Inbreeding is generally discouraged in animals, including cats. Responsible breeders avoid mating closely related individuals and prioritize genetic diversity to ensure the health and well-being of their animals.

If you're considering breeding cats, it's crucial to consult with a veterinarian or experienced breeder to understand the risks of inbreeding and make informed decisions about breeding practices.