I have almost earned my kittens trust. How can I now train him to use the litter box? He is 3 months old and if I can't train him today or tomorrow, my mom said she will throw him out!

Kittens need a soft substrate and privacy. Make sure your litterbox is accessible to the kitten (the sides should not be so high that he struggles to get into it). Keeping the litter box clean by scooping it daily and washing it out weekly is also recommended. Cats prefer non-scented small grained litter. You should have 1 litterbox per cat in the household, plus one extra. If your kitten is not using it litterbox, have a veterinarian examine him and submit a fecal and urine sample for lab testing. This will rule out any physical problems your kitten may be experiencing.