Since you're 51 years old you should have learned some manners by now. Do not offend someone in their own home. Eat what's put before you without whining and thank your hosts for sharing their food and time with you. You don't have to actively participate in a prayer to a deity you don't believe in. Just tell the old mother-in-law what a great cook she is and how nice it is to see them.
Personally I hate any kind of public praying at any place on any occasion. When it happens I don't go into a snit and bitch about it, I simply don't participate in it.
Personally I hate any kind of public praying at any place on any occasion. When it happens I don't go into a snit and bitch about it, I simply don't participate in it.