Hello Irisheyes,
I believe the following marriage record found on rootsireland is your family
Civil Marriage Record
Date of Marriage:27-Feb-1876 Parish / District:TullamoreCounty:Co. OffalyHusbandWifeName:JamesEganLizzieHenseyAddress:Barrack St. TullamoreBarrack St. TullamoreDenomination:Occupation:CarpenterButchers DaughterAge:2118Status:BachelorSpinsterHusband's FatherWife's FatherName:JamesEganMartinHenseyAddress:Denomination:Occupation:CarpenterButcherHusband's MotherWife's MotherName:Address:Denomination:Occupation:Witness 1Witness 2Name:DuffyWilliamHenseyMargretAddress:Notes:
Church: Tullamore
Priest: Leonard P. CC
© 2015 Copyright Irish Midlands Ancestry (Laois + Offaly)
www.rootsireland.ie
There are a number of baptismal records from 1849 to 1859 but I cant know which record is yours. There is no mothe listed as McLachlan. there is a Catherine Kilmartin. there is also no listing for a baptismal in 1855 or 1856. Keep an open mind regarding dates as most people who emigrated at that time were illiterate and undocumented. Their ages were only guessed at port of entry.
Good luck in your search,
Anne Dennehy