Keep good collection of your favourite songs in your cell phone or mp3 player. Also do not forget to carry your earphone with you.
In case your family members have not got adjacent seats during automatic seat assignment then make a humble request to other travellers and try for seat exchange so that all of you can sit together.
Get cell number of the bus conductor. In case you miss something in the bus then you can reach the conductor and ask him to keep your belonging with him.