Read the text below and answer the question!

   On Sunday, Tom gets up at 10 o'clock, then he reads his newspaper in the kitchen. He has breakfast at 11.30 and then he telephones his mother in Scotland.

   In the afternoon, at 1.00, Tom plays tennis with his sister and after that, they eat lunch in a restaurant. At 6.00, Tom swims for one hour and then he goes by bike to his brother's house. They talk and listen to music.

   Tom watches television in the evening and drinks a glass of milk. He goes to bed at 11.30. 

Who does he telephone in the morning?