You won't get anywhere without at least a name to work with, so first do some family research. Good luck, but keep in mind that there are lots of family stories like this and there were not enough passengers and crew to fit them all.
Suggest you log onto the page on this site giving passengers and crew lists. As Bob says, this is not an esy search withjout so little data. e.g. I have found three Henrys in the catering Staff,,two 18 year olds and a 16 year old.
I can attest to what Bob said about there being a lot of family stories. My own family insisted that we had a relative aboard Titanic, and there was one or two women and a man with our surname (on my mother's side). The man even shared my great-grandfather's full name, and both died of drowning! However, I've proven that none of my relatives were on Titanic. It did give me impetus to explore those who said they were, but were not! No, the closest we came to the ship was that my grandfather attended a civic meeting where actual Titanic survivors told their stories. I wish I had known about this when my grandfather was alive, so I could have talked with him about it!