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I located this record on Roots Ireland. Did not find any siblings. I located the parents marriage record in 1836. You would think there were more children between 1836 and 1846. You may want to scan the parish register. https://registers.nli.ie/parishes/0727 I did not see Michael Lambert in the Griffiths Valuation head of household listings. Did the family emigrate?
Name:Michael LambertDate of Birth:
Date of Baptism:15-Feb-1846Address:RathvillyParish/District:RATHVILLYGender:
Father:Michael LambertMother:Anne KennaOccupation:
Sponsor 1 /
Informant 1:John Kehoe Sponsor 2 /
Informant 2:Anne Kehoe
Date of Marriage:21-Jun-1836
Parish / District:Rathvilly
Husband MichaelLambert Address:Rathmore
Wife Anne Kenna Addrress Rathmore