Biological, nope. I wanted them, but my wife doesn't. More than enough nieces, nephews and cousins by the gross. I'm the crazy uncle who most of them come to when they have a problem or need to ask a question that they are sure will freak out the parental units. I still 'understand' (usually meaning that I am not so wrapped up in some of the more unfortunate delusions of parental godhood that I forget I'm human...and so are they).