[This is getting a little ridiculous. Whoever this is, is getting far too worked up over something that makes no sense at all to Thor. He tries to speak calmly, even soothingly, despite his confusion.]

My friend, I am sorry, but Loki has no children. He would have to at least have a woman for that, and he has been rather unconcerned with romance as of late.

[He offers the best explanation he has:]

You and I obviously come from places where the stories of Ragnarok and my people are very different. Why, there are mortals here on this very voyage whose history does not tell of the great attack on Midgard's New York City that was so recent a battle for me, so for them, it did not happen. Perhaps this is something like?

[Though now he's really worried what this fellow will do if he meets his brother. If it is possible that this Loki isn't the one who wants to kill him, the last thing he wants is for someone else to attack him.]