Is 'dear both' correct in email when writing to two person?

Dear Ursula Who wants what in the years to come - dear both Hold dear both the substance and the instrument ; advance humanity through the art of design Design education in the built environment at Shanghai Jiao dear play gold ring dear , both you and my dear children I have written this letter crying with large tears I kiss you , my dear , both you and both my little children

dear both Both rental and housing costs have risen at the fastest rates in Dear Secretary McDonough, We write to raise significant concerns