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have a heart-to-heart talk stresses
gen.	поговорить начистоту (a talk or discussion in which two people talk honestly and in a serious way about their feelings (Cambridge Dictionary) ART Vancouver); поговорить по душам (a talk or discussion in which two people talk honestly and in a serious way about their feelings (Cambridge Dictionary) ART Vancouver); откровенничать (Tanya Gesse)
Gruzovik	по душам поговорить; по душам говорить
idiom.	вести задушевную беседу (Пузлмейкер)
Makarov., humor., nonstand., dial.	поговорить за жизнь (или)

have a heart-to-heart talk: 3 phrases in 2 subjects

General	2
Proverb	1