My e-mail is cdn_pet@yahoo.ca if you are comfortable not going through a third party. But I do understand. Ironically I have a Leblanc thread in my mothers family ( a niece married a Frank Leblanc ).
Can I assume you are in the USA. I would love to share info.
I have been out to Bourg Louis a couple of times, long story, But if I can remember there were some Grays buried there in St Bartholemew's Churchyard. I have a photo of the church if you are interested

Paul