Can I bring a person whom I trust to the photo session?
Yes, that is absolutely possible.
Best option is a friend who likes your steps to photo-modeling and supports you. We should talk before the shooting/ meeting if you bring somebody with you.
We have had some bad experience with older brothers and boy-friends/husbands. They sometimes tend to a protective behavior or are just jealous. And sometimes models “forgot” to tell them what kind of photos they decided to do and then it was a problem when they wanted to take on the bikini and the brother or husband meant it good, when he tried to protect the “poor girl” from the photographer.