Maureen F. Hartigan

I am searching for Dennis Brennan and wife

(maiden name has been claimed to be Carroll
but his daughter's death certificate says Lennin).
Their daughter Sarah (born 1865 in Schuylkill County)
is my great-grandmother. I think she had sisters named
Marguerite/Margarite amd Ellen but don't know more.
Dennis and wife were both born in Ireland.

Maureen