Neat! Did his family pass down any family history about the Laquays? I think you saw my post about trying to connect these Laquays with mine. I'm interested to see if your BiL's Laquays had some family lore where a few brothers came over from France. I was in contact with a Laquay in France who told me that no one in his tree came to the US, but he did hear of some Laquays (I guess not directly related) from Eastern France who did.
I live in New Jersey, but I work full time so theoretically it should be easy to research these records for Peter Sr. Unfortunately, because of work, it is not. However, I plan to go to the Somerset County Clerk's office after Christmas to see if I can find the actual record for Peter Larkey and Polly Vantine. I'll keep you posted. I also have inquiries into the Hillsborough Reformed Church (believed to be the Dutch Reformed Church that the marriage and few christenings took place). If I have time, the same day that I'm at the Somerset clerk's office, I will try to head to Hillsborough to check out the church records.
I found a newspaper index for Rochester, NY where there is a marriage announcement for Anna Maria Laquay and Stephen Hopkins. Anna Maria is supposed to be one of Peter's daughters born in Millstone, NJ. I also found what I believe to be her death announcement, Stephen's death announcement, and their daughter's marriage announcement. I should receive the original articles in the next few weeks. I will be glad to share my findings. Peter is presumed to be dead at this point, but maybe Anna's mother was still alive.