Possible Clues:

• Relative by marriage (2 words)
• After fashionable Hollywood setting, wedding's introduction for Meghan to Harry's family?
• Family member acquired by marrying
• Relative where one finds Hollywood wife
• Spouse's sibling, e.g
• Family member via marriage
• Wife's sibling, e.g
• Newlywed's new relative
• Wife's sister perhaps through with teaching, some said
• International legislation keeps any number relative