Hi
I have heaps of information on Sam and Sally Owens. There is more than one Sam Owens though and this can cause confusion. My Sally did remarry a Stubbs, so you might be in the right track. I have a Maria Owens, daughter of Sam and Sally, born in 1847 and marrying at age 14! To a George Wilson in 1861. However, this daughters branch is a bit thin in my research, and I have not yet made sure it is correct. Does this basic information re-inforce your research? If so I am happy to share my research.
Cheers
Greg.