On TLC's 'Sister Wives,' Kody's son, Gabriel, breaks down in tears about his dad forgetting his birthday. In a side interview, the 21-year-old explains his father called him when Kody and his wife, Robyn, contracted COVID. Gabriel had it months before. However, Kody called on his birthday and didn't even mention it. Gabriel sobs while talking about it. 'Sister Wives' airs Sundays on TLC.