This is not to castise the original poster, but I have to agree with Jantarei above.  Far too many times I see requests like this, looking for a travel companion for elderly parents after the tickets are bought.  Sounds rather irresponsible, don't you thnk so?  

First, find someone who is willing to be the companion.  Before buying the ticket, ask around - here in Sajha or elsewhere.  
Then, once you find the appropriate companion, buy your parents' tickets accordingly.

Why put the cart before horse?