Toi khong co biet danh dau cho nen cai nay co the kho hieu. Bay gio toi muon biet, luc nao dung chú hay la bác?

Neu ma Anh toi co con, thi con cua Anh toi se goi toi bang chú hay la bác? Toi khong hieu cai dieu nay.

Con Chi toi co con, thi no se goi toi bang cai gi?

Cam on!!

Thank you!!