User blog comment:Omega natsu2/Chapter 413: The Book of E.N.D., Predictions./@comment-204.110.47.10-20141210190057/@comment-9595671-20141212191459

I'm not sure Igneel has a mate, and I say that because Natsu never has said anything about finding a mother.

And if you mean biological mother... I'm not sure she'd even be able to put two and two together. Plus Mashima might not even consider that idea.