Stapleton, Tobias m. McGrath, Johanna (alias Judy)

Hi

I know that my Stapletons come from Killoskehan, as I have found some of the baptisms of the children of Tobias Stapleton and Johanna(Judy) McGrath in the parish of Drom:

Bridget (1830), Elizabeth (1832), John (1836), Matthew (1839), Tobias (1841), John (1842), plus there were meant to be three other children, who died as infants. Some of the children went to Victoria, Australia.

Can anyone help with linking the witnesses of these baptisms to this family? They include Judy Stapleton, Matt McGrath, Cath Stapleton, Kitty McGrath, and others of different surnames. Is there a marriage record for Tobias and Johanna or any further information on their families?

Thank you

Karina