When Roger is first introduced to us- and Molly- it is through word of mouth, from his parents. This doesn't give Molly a great opinion of Roger, because the Hamleys always underestimate their younger son. When they first meet, Molly is not overly impressed with his looks or his personality, but that first impression soon changes. When she is devastated by the news of her father's marriage, it is Roger who comforts her and advises her- albeit awkwardly- and encourages her to look at the situation from her father's point of view. Then, out of kindness and concern, he spends time teaching her about the studies in plant and animal life he's involved in, to keep her mind occupied with something other than her situation.