1. Mary's(older/elder) sister has been staying in the USA for seven years now. 2. Whose grandfather is(older/elder) yours

1. Mary\'s elder sister has been staying in the USA for seven years now. 2. Whose grandfather is older, yours or Ivan\'s? 3. Collin is the oldest student in our class. 4. Is Steve your elder or your younger brother? 5. My uncle is the eldest member of my family. 6. My friend William is a year and a half older than me. 7. The building of our school is older than all the other buildings in this area. 8. Do you know that Mr. Richardson\'s elder daughter is a ballet dancer?