I need help please! :)

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

Y’all i need answers plss people are saying me and my brother look alike although we’re two different ages. one year apart i’m a girl, btw i’m thinking we could be fraternal twins idk my parents and my friends think we look alike

In which situations is the principle of cross-cutting relationship useful in determining relative age?