Cousin dating is not okay
For instance, it is okay to date your: Step Cousin, Step Second Cousin, Step Third Cousin, etc. Having children with a close relative is another matter entirely.
it is even okay to date a step Brother or sister, however it is slightly looked down upon by most societies. On the other hand, a so-called "step cousin" is not really rel ted to you at all.
But from what you tell me about this situation, it is far from the biblical warning.
The important thing is not to rush them in to it or possibly rush yourself into it.Now, there may be other reasons that this arrangement is bad.