28-year-old pregnant woman (pregnant with the second boy) to see a 39-year-old woman must be called auntie, to see a 35-year-old man called brother, can it?

No. 28-year-old see 39-year-old woman, called sister better. The first thing you need to do is to get a good deal of money to pay for the services you need, and you'll have to pay for the services you need.

Try not to call the wrong, will appear to be impolite, ignorant, called before confirming the other side, or familiar people around. Avoid misunderstandings and invite trouble.