“Monarch: Legacy of Monsters” is a family affair. In the show’s present day, Cate Randa, portrayed by Anna Sawai, is trying to learn the truth about her father’s disappearance along with her newly discovered half-brother Kentaro (Ren Watabe) and May (Kiersey Clemons), an expat hacker running from her past. Over the course of the series, they’ve learned that the Randa family has long been in the business of studying Godzilla. Episode 9 of “Monarch,” which hit Apple TV+ last week, picks up after a cliffhanger that saw Cate, May and Lee Shaw (Kurt Russell) fall into a giant hole in the ground and…