What is another factor that might affect us besides genes that can define our traits?

Actually there are a lot of external factors which can affect our personal traits. Some examples would be the type of environment we are living in, the kind of upbringing that we have, the social economic status of the community, or the type of friends.

children tend to take more after their grandparents more than their parents. it’s the dna you received that was passed down to you somewhere in your family. maybe one of your grandparents had/has straight hair and you might have gotten it from them.