Bob Smith is old. He has two big houses and a new car. He has no wife, but he is a father of four children. He has two sons and two daughters. One son is from   Canada. His name is Jack. The other   is from England. His name is Mike. One of his daughters is from China. Her name is Meimei. She is eleven years old. The other is from America. Her name is Lucy. She's eleven, too. Bob Smith is not the children's real father, but he loves them very much. The children love their "father", too. Bob Smith has many toys   for the children. He gives different   toys to different children. The boys play with toy cars. The girls play with doll   and toy animals. Bob Smith is their good friend. Bob is children's  _  .
real father uncle English teacher friend