b) Is that Michael's car?
c) It's Tessa's birthday on Saturday.
d) What's your mother's name?
e) Where's Philip's desk?
f) My husband's name is Peter.
g) Jo is my sister's friend.
h) Carla's house is in the centre of Rome.
Везде добавляется 's, чтобы образовать притяжательный падеж. (т.е. вещь кому-то принадлежит).