best interests 

The term for the most blunt and honest type of suggestion given to someone in a time of strife.

US Coast Guard admiral Richard Larrabee said after finding pieces of wreckage from EgyptAir Flight 990 "We believe at this point it is in everyones best interests to no longer expect we will find survivors in this case".

best interests by NWeiner March 14, 2012

CHILDS BEST INTERESTS 

A current or future physical , emotional enviroment for a child suggested by state (family services) only with the consent of the childs parents & grandparents except where there has been a criminal conviction for abuse against said child

it`s in the childs best interests to remain in care as there may be a risk of emotional harm in the future

CHILDS BEST INTERESTS by JACK`S DAD June 11, 2011

Best interest 

You have good intentions for something or someone

You like me but your dating someone else I’ll keep it in your best interest 😉

Best interest by Okonamahailey March 27, 2020