I have John Canavan in the 1851 Census for Wales.

The 1851 Census entry is:

John Canavan, Head, 59, Annuitanat,IRL, Lucan, Dublin.

Martha Lavinia Saies, daughter,Married,23, Annuitant's daughter,IRL, Buttevant CORK.

Henrietta Powell Canavan, daughter,17, Annuitants daughter, IRL, Cove of CORK.

Charles SAIES, son-in-law- Married,37, draper,Pembroke, Steynton, WALES

Charles Canavan SAIES, Grandson, 1 month, PEM, Haverfordwest, Pembroke

I have info on the SAIES family to share. Would love to hear from any Canavan family.
Jocelyn