'SEN' or 'SİZ' ?

What do you call your parents?Mother?Father?Mum?Dad? or do you call them by their first names?These days,many young children call their parents,and their parents' friends,by their fisrt names.However ,in many countries this kind of familiriaty is very impolite,and as a result many of the older people become uncomfortable.
In some languages,such as French and Turkish ,there are two forms for the word 'you'.In Turkish, 'sen' is the informal form and 'siz' the formal.In French ,the familiar word is 'tu' and the more formal one is'vous'.In English ,there is only one from ,'you', altough a few hundred years ago there was also the formal expression 'thou'.
In Turkey and France ,the two forms of the word are part of everyday life.In both countries it is often unacceptable for an older person to be called by the word 'sen' or 'tu' when he is talking to a younger person,but the young people usually use the informal form when tey are talking to each other.In France, the change from 'vous' to 'tu' shows a change in the relationship.English speaking people-Australians,Anericans and the British- never have this difficulty because they don't have another choice:))