Hello again Pauline!
I checked on the subscription site Roots Ireland and found five children of Patrick Galvin and Mary Regan. Michael 1833 Anne 1835 Catherine 1846 (likely died young) Catherine 1849 and Margaret 1856. I mentioned in your other message that the Kinvara records have a six year gap from 1837-1843. I listed the record for Margaret below. I did not come up with a record for Sarah but you should scan the parish register using the link I provided on the other message.
Not able to locate a place called Kemana.
Let me know what questions you have.
Name:Margaret GalvinDate of Birth:13-Mar-1856
Date of Baptism:15-Mar-1856Address:KinvaraParish/District:KINVARAGender:FemaleCountyCo. Galway
Father:Patrick GalvinMother:Mary ReganOccupation:
Sponsor 1 /
Informant 1:Patrick HamberrySponsor 2 /
Informant 2:Honor Nilan