couldn't find anything for Richardson birth,the one i did find looks like his brother.the Richardson marriage looks like his relations, plus his parents marriage, just in case you didn't have it.
regards Mary.
Record Type Civil Marriage
Date of Marriage 20 Dec 1847
Groom Name richardson KEIGHTLEY
Bride Name matilda CLARKE
Church Desertlyn Church of Ireland
Parish Desertlyn
Civil District Cookstown
County Londonderry
Record Type Civil Marriage
Date of Marriage 13 Nov 1861
Groom Name james KEIGHTLEY
Bride Name rebecca MCMASTER
Church Magherafelt Church of Ireland
Parish Magherafelt
Civil District Magherafelt
County Londonderry
Record Type Civil Birth
Date of Birth 23 Feb 1868
Name John KIGHTLY
Gender M
Fathers Name James KIGHTLY
Mothers Forenames Rebecca
Mothers Maiden Name MCMASTER
Civil District Magherafelt
Sub District Magherafelt
County Londonderry