Watch How I Met Your Mother Season 4 Episode 15 online via TV Fanatic with over 6 options to watch the How I Met Your Mother S4E15 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and Amazon Prime.
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The gang meets Barney's wife and kid they never knew existed. Of course, we know it's all just a show for his mother.