Thanks for your posting.I'm actually researching the Rossiter family and think that this posting of mine was to do with Rossiter-Furlong marriage links.
I think I posted it because I do not have a year of birth for Stephen or Mary and hope that you do!!
However, I did some checking and Stephen and Luke were the sons of John Joseph Furlong born 1810 in London and his wife Laurencine Beauverger born circa 1810 in Mauritius probably as they married there in 1836.
John was the son of Luke White Furlong ( born 1782) and Maria Acton ( born 1784).
I'd be interested to hear what you have as I have a lot of Furlongs in my database who might be related.