Approximately how old? If they are around 3 months they can eat adult food. For a cats 5 months is nearly grown, at 6 months they should be neutered/spayed.
The best food for cats is canned, NOT dry and NOT Friskies or Iams. Wellness, Eagle pack Holistic are decent, thosevare the two I feed, but I know there are others. I'm sure the cat nutrition experts will be along soon to tell you more
Dr. Seuss~DLH (brother's cat)~June 2007-
Misty~DSH (my cat & Mooby's mom)-?- Sept. 15, 2014
MooBoots(Mooby) ~ DMH(Mom's cat)~July 21, 2008-
Sunshine~ Golden retriever X white german sheperd (Dad's dog)~October 24, 2008-