More than one father of kittens

Question
I spent 10 years volunteering at a animal shelter and know that female cats can mate and get pregnant with more than one father in on litter.  My question is, how many males can father one litter?  We have a neighbor that has a cat that is definitely a Chocolate or blue point Burmese or Siamese.  She that this couldn't be because the father is orange and the mother is black.  Can you help me to explain this to her?

Answer
Rosemarie,

This can occur even if the only father is the Red Tabby.

How come?  The gene that makes the Siamese or the Burmese pattern has 3 alleles, wild, Siamese, and Burmese. The Siamese and Burmese alleles are both recessive to the wild allele.  So, if both cats are carrying either allele, kittens could have a Siamese or Burmese pattern, or, if a kitten is carrying one of each, it could have a mink pattern.  Thus, the kitten would have had to have gotten a Siamese and/or Burmese gene from the one parent and the Siamese and/or Burmese gene form the other parent for the kittens to be pointed.

Even if there were another father involved, the Black mother would have to be carrying the Siamese and/or the Burmese gene for the kittens to come out with the Siamese, Burmese, or mink pattern (1/2 way in between Siamese and Burmese with aqua eyes).

Similarly chocolate and blue are both recessive alleles of the brown gene and the dilute gene respectively.  Both parents would have had to contribute chocolate for kittens to be chocolate points.  Both parents would have had to contribute dilute (blue) for the kittens to be blue points.  Even were another father involved, the mother would still have to carry these genes.

If this is not super helpful, please come back to me with specific questions on the above.

Best regards.... Norm.