I took in three red tabby kittens at nine weeks - it wasn't long
before they discovered that Tigger (obese middle-aged neutered male)
would groom them, cuddle them, and generally be as much a surrogate
mother as he could, and that Spooky (elderly neutered male) was also
willing much of the time.  They are twenty-three weeks old now, and
still cling to Tigger and Spooky.