How I Met Your Mother is about to solve a longstanding mystery.

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In next Monday’s episode of the departing CBS comedy, viewers will finally learn the names of Ted and The Mother’s son and daughter (played by David Henrie and Lyndsy Fonseca, respectively).

HIMYM co-creator Craig Thomas confirmed the forthcoming reveal late Wednesday at a farewell Q&A/reception on the show’s set for members of the Television Critics Association.

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Thomas also shared that the title of March 31 series finale is “Last Forever,” and added three more names to the swan song season’s alumni parade: Rachel Bilson, Sarah Chalke and Lucy Hale (all of whom will appear in upcoming episodes).