Have you carefully thought through your plan for husband-wife crew?

What will you do if they get into a hallacious argument or real fight
when on board and away from home port? (I know this happens, as it did
to a friend when I was on board. It was a real mess for several days,
until wife could leave and fly home.)

Strongly suggest you try wife's or husbanad's cooking skills as part
of interview process. "Housekeeping" same.

Husband's and wife's mechanical and mantainance skills?

Navigation skills?

Ask and then confirm re crew candidates' stamina over long days and
maybe nights.

Criminal background check?

"Talk" with previous employers -- in depth and at length for quality
references.

Etc.