Two cats

this morning I came home from my sister's and I looked in the backyard i saw a gray cat sleeping on my chair with a cushion on it sleeping than he left , now i looked in the backyard same cat is back again sleeping on the same chair& this time he brought a friend, a black cat, now i have one sleeping on the lawn and one on the deck. i guess they decided to make themselve's at home in my backyard for christmas.