Stop worrying about these tiny matters, like all threads have indicated, no matter how wonderful you are, you are still a DIL and he is their SON, there will always be a difference in the way you are both treated.
You are newly married, enjoy this time with your husband and your In laws, your behaviour in the early days of your marriage will have a lasting effect on all fo them.
Its up to you to build this relationship, accept them (in laws) with all thier flaws, and remember your one of the lucky ones, you dont have to live with them day in day out, you and hubby have your own lives.