Crossword puzzle clue "novelist who had two spouses simultaneously"

Novelist who had two spouses simultaneously

Its two halves can't run simultaneously

Plays two notes simultaneously

"Fancy" singer featured on "Problem" who in 2014 became the second ever to be simultaneously #1 and #2 with her first two hits: 2 wds.

Item in Schrödinger's box (and in this puzzle) that exists in two different states simultaneously

"I Want to Hold Your Hand" and "She Loves You" group who in 1964 became the first ever to be simultaneously #1 and #2 with their first two hits: 2 wds.

Second of two spouses?

Simultaneously