Hello Irene,
On the 1861. census index, for St Quivox. Ayr. we have this family.
Sweeny Sheals, age 28 years,
Sweeny Lettia, age 27 years,
Sweeny Ralph, age 15 years,
Sweeny Agness, age 4 years,
Sweeny Cathrine, age 2 years.
Was your Miles, married to Letitia Smith, if so then this is your family in the above census, this is only a index to the census, you can purchase the full census at Scotlandspeople. the above spellings are the exact spelling on the original census index.
Regards,
Jonn.