Another option is to find a kitten adoption network or rescue group in your area. These organizations are dedicated to finding homes for unwanted or abandoned kittens and may be able to help you place the kittens with responsible and loving pet owners. Some websites like Petfinder, Adopt-a-Pet, and The Shelter Pet Project aggregate listings of adoptable pets from shelters and rescue organizations across the country.
Additionally, you can try posting about the kittens on social media platforms or online classifieds websites, such as Craigslist or Facebook Marketplace. Make sure to screen potential adopters carefully to ensure they are suitable pet owners and will provide a safe and loving home for the kittens.
Please note that it is generally not recommended to kill kittens unless they are suffering from severe health issues or birth defects that would significantly impact their quality of life. Euthanasia should only be considered as a last resort when no other options for placement are available. If you think the kittens might be having problems with growth or medical care and wish to talk with someone please ask.