Relationships

Is it okay to date my step-father's nephew?

So my mother has been dating a man, we'll call him T, for about 5 years. My mother and T plan to get married. T has a nephew (his brother's son.) My mother is absolutely convinced the nephew and I are "a match made in heaven" so she has been trying to set us up. The nephew and I have gone on a few dates and we do get along quite well.
So what I want to know is whether or not it is okay to date (possibly marry since I don't date without that in mind) someone my mother's husband is kin to.
I'm not sure if there is such a thing as step-cousin.
(I also do not think of the nephew as a cousin since he and I only met after I was already full grown and I do not consider T a father figure since I actually grew up with my dad.)

Yes, it is okay.
No, it is not okay.
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Is it okay to date my step-father's nephew?
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