person dada ad person sham are dating and person sham and person yaya are best friends,dada and yaya are now best-friend-in-law
when your best friend is dating someone the boyfriend/girlfriend becomes your best-friend-in-law
"person dada ad person sham are dating and person sham and person yaya are best friends,dada and yaya are now best-friend-in-law" What is the definition of "best-friend-in-law"?