Eh, can't be so coincidental that everytime you two go out, you
will bump into some relative or friend. After a while, if the
relationship is to develop further, definitely you will need to go
out on single dates ...
After a few single dates, then casually bring up the topic of you
two being together but again, don't come on too strong, maybe he
wants things to develop slowly etc.
Whatever it is, someone has to take the initiative soon ... be it
one week from now or one year.
Things have to be discussed between the two of you. 
