soory to hear your loss mate,
but most companies wont give you the time off if a grand parent passed away
happened to me with my nan which i was very close too
they said only if my parents or sister passed away they would give me time off
the only way i could do it was book my holiday
so i did that, then took a week on the sick as i still wasnt ready to return to work
companies are wankers when it comes to things like this