Cornwall OPC (www <dot> cornwall-opc-database <dot> org) has these baptisms to Robert & Elizabeth:
2nd May 1830, St Austell, Stephen Davey
17 June 1832, St Austell, Edwin Davey
26 December 1833, St Austell, Elizabeth Ann Davey
1st January 1837, St Austell, Samuel Davey
6th January 1839, St Austell, Elizabeth Ann Davey
7th May 1843, Mevagissey, Mary Jane Davey
12th April 1846, Mevagissey, Harriett Ann Davey
6th April 1851, Mevagissey, Henry Davey
Residence is always Pentewan
There is also this burial:
12th January 1834, St Ewe, Elizabeth Anne Davey, age 9 weeks