Cher Les Hommes (and don't ever say mens in english, again)
chers amis is how to say dear friends in French.
Dear daughter is 'chère fille' in French.
You are lying is "tu mens" (singular and familiar) or "vous mentez (plural OR formal) in French.
bathroom in French is salle de bains
"Cher grand-parents" it's the same except for 'dear'.
Cher oncle
Cher John
chère famille
cher oncle
mon Cher is French for my dear.
mon cher cœur
notre Cher ami