Can anyone help?

I need some information on WW2 medals, in particular the following:

1939 - 1945 Star
Italy Star
Defence Medal
War Medal

My Grandad received the medals in memory of his uncle who died in WW2. Sadly my grandad passed away on Sunday and it was his wish to be buried wearing the medals. I am not sure which order they should be worn in and I heard that if the medals are being worn in memory of someone else they should be worn on the opposite side.

Can anyone help me, Thank you.